Gwen Stefani and Gwyneth Paltrow lead the star-studded guests at Robert Downey Jr's wife Susan's 40th birthday bash

By Daily Mail Reporter

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As Iron Man, there is no greater task off-limits for Tony Stark.

And in real-life it seems that Robert Downey Jr is just as impressive - as he managed to haul a host of A-lister's to his wife Susan's 40th birthday celebrations in San Francisco on Monday.

Robert has been keen for his film producer wife - who turned 40 on November 6 - to celebrate her milestone birthday in style.

VIPs: Gwen Stefani and Gwyneth Paltrow both attended Robert Downey Jr's wife Susan's 40th birthday party at the weekend
VIPs: Gwen Stefani and Gwyneth Paltrow both attended Robert Downey Jr's wife Susan's 40th birthday party at the weekend

VIPs: Gwen Stefani and Gwyneth Paltrow both attended Robert Downey Jr's wife Susan's 40th birthday party at the weekend

Susan is said to have enjoyed a luxury stay at the Cavallo Point resort near Sausalito, California, among a number of their favourite friends.

On Sunday, the famous crowd - including Gwyneth Paltrow and Gwen Stefani - were seen tucking into some delight from a food truck parked in a nearby park for an outdoor pic.

Hopefully the staunchly healthy Gwyneth was able to find something appropriate to eat from the truck, that dished out burgers and fries.

Air kisses! Gwyneth Paltrow greets another party-goer the Hollywood way

Air kisses! Gwyneth Paltrow greets Robert Downey Jr the Hollywood way at the party for his wife's birthday

Impressive guest list: Robert Downey Jr is seen in front of Justin Theroux as he greets yet more people for his wife's birthday bash

Impressive guest list: Robert Downey Jr is seen in front of Justin Theroux as he greets yet more people for his wife's birthday bash

Child-friendly: Gwyneth and other celebrities that attended brought along their broods at the kid-friendly event

Child-friendly: Gwyneth and other celebrities that attended brought along their broods at the kid-friendly event

She certainly seemed to have a lot to catch up on with Jennifer Aniston's beau Justin Theroux has the pair were seen chatting away.

Hollywood stars who joined the happy couple included Justin Theroux, Reese Witherspoon, Gavin Rossdale, and Jon Favreau.

A source told E! News: 'It was a great weekend for Susan, and Robert went all out to make sure she knows how special she is.

Famous friends: Gwen stood and chatted with Jennifer Aniston who was dressed all in black for the occasion

Famous friends: Gwen stood and chatted with Jennifer Aniston who was dressed all in black for the occasion

A-list catch up: Gwyneth stops to talk to actor Jason Bateman at the bash for a brief moment

Fancy seeing you here: Gwyneth stops to talk to actor Jason Bateman at the bash for a brief moment

Mother and baby: It was a very child friendly affair at the bash, and Gwen Stefani - who is rumored to be pregnant - couldn't take her eyes off a little one

Mother and baby: It was a very child friendly affair at the bash, and Gwen Stefani - who is rumored to be pregnant - couldn't take her eyes off a little one

Kicking back: Jennifer Aniston's fiancee Justin Theroux took a moment to himself to enjoy the sunshine at the outdoor event

Kicking back: Jennifer Aniston's fiancee Justin Theroux took a moment to himself to enjoy the sunshine at the outdoor event

Man of the moment: Robert continues to chat to guests who have arrived to celebrate his wife's 40th birthday in San Francisco

Man of the moment: Robert continues to chat to guests who have arrived to celebrate his wife's 40th birthday in San Francisco

Fun and games: Justin Theroux appeared to receive some very happy news as he chatted to guests at the bash

Fun and games: Justin Theroux appeared to receive some very happy news as he chatted to guests at the bash

Cool guests: Justin Theroux and Jason Bateman were just some of the Hollywood actors at the birthday event
Cool guests: Justin Theroux and Jason Bateman were just some of the Hollywood actors at the birthday event

Cool guests: Justin Theroux and Jason Bateman were just some of the Hollywood actors at the birthday event

'Around 50 of their closest friends came up for the weekend and stayed at the hotel in historic houses. It was a very relaxing weekend and there was a lot of time for people to catch up.'

On Saturday night they partied in the ballroom of the hotel which was followed by a fireworks display. The celebrations were family-friendly with entertainment provided for children too.

The source added: 'There were kids running around everywhere, and the whole weekend catered to families. They had lot of kids' entertainment and the children were included in all of the events, even the nighttime birthday party.'

Not the food you'd find on GOOP: Hopefully Gwyneth was able to find some edible grub from the food truck that sold burgers and fries

Not the food you'd find on GOOP: Hopefully Gwyneth was able to find some edible grub from the food truck that sold burgers and fries

Her little mini-me! Reese poses with her daughter Ava at the event which was organised by Robert Downey Jr

Her little mini-me! Reese poses with her daughter Ava at the event which was organised by Robert Downey Jr

Happy guests: Reese Witherspoon brought along her new baby son Tennessee for the occasion

Happy guests: Reese Witherspoon brought along her new baby son Tennessee for the occasion

A walk in the park: Reese and her husband Jim Toth enjoy some food and beverages as they take a stroll during the event

A walk in the park: Reese and her husband Jim Toth enjoy some food and beverages as they take a stroll during the event

Relaxing: Bridesmaids actress Maya Rudolph takes in the surrounding as she chills out with the A-list crowd
Relaxing: Bridesmaids actress Maya Rudolph takes in the surrounding as she chills out with the A-list crowd

Relaxing: Bridesmaids actress Maya Rudolph takes in the surrounding as she chills out with the A-list crowd

Great outdoors: Maya Rudolph and her husband Paul Thomas Anderson enjoy a stroll in the park along the San Francisco Bay area

Great outdoors: Maya Rudolph and her husband Paul Thomas Anderson enjoy a stroll in the park along the San Francisco Bay area

Adding: 'The whole group was very tight and very friendly. There was lots of hugging and reminiscing with old friends.'

On Sunday morning the group enjoyed brunch before singing happy birthday to Susan and leaving.

The sourced added: 'When it was time to go on Sunday, everyone talked about how much fun they had and that it was too short. They wished it could have lasted longer.'

Family outing: Reese takes a stroll with her daughter Ava and husband Jim Toth on Sunday

Family outing: Reese takes a stroll with her daughter Ava and husband Jim Toth on Sunday

Party: Robert Downey Jr organised a child-friendly 40th birthday party for his wife Susan on Monday

Party: Robert Downey Jr organised a child-friendly 40th birthday party for his wife Susan on Monday

Whatta guy: It certainly must have taken some top-notch organizing skills for Robert to pull off his wife's birthday celebrations in San Francisco

Whatta guy: It certainly must have taken some top-notch organizing skills for Robert to pull off his wife's birthday celebrations in San Francisco


The comments below have been moderated in advance.

Cool crowd, no posers

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Now I am really confused, Gwenn attends a birthday bash, dressed like a normal mom, But when she is out in the street she treats it like a photo shoot?

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he's absolutely gorgeous

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We need more RDJ photos!!!!! He's looking so damn hot !

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Were the photographers several miles away from the party?? Most of these photographs are terrible!!

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Love that photo of RDJ in the black beanie and grey knitted waistcoat thing. Very nice!

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unless he changed clothes halfway through, that is not him in the grey thing. He is definitely the one in the army green in the later photo. He was misidentified in the earlier photos. you can tell in the shots that show the grey outfit guy's face.

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That's Gavin Rossdale, based on the other photo showing GR wearing that outfit.

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Must be strange for these people. They're all famous, all their mates are famous. There are no "normal" folk there at all...

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Here comes Gwyneth asking everyone to join her waspy war on Vanity Fair

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I reckon that would have been a lot of fun to attend. Way to go Robert! But I'm pretty sure that some of the captions are incorrect.

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Justin theroux dresses like a tool

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