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Jack Osbourne holds hands with pregnant wife Lisa Stelly as she showcases her baby bump in a floaty two-tier dress

Published: 14:20 EST, 6 April 2015 | Updated: 14:43 EST, 6 April 2015

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Their second pregnancy isn't about to stand in the way of their social life.

Because Jack Osbourne and his newly-pregnant wife Lisa Stelly were among the stars celebrating good friend Robert Downey Jr's 50th birthday bash in Santa Monica on Saturday.

Lisa, 28, revealed her growing baby bump in a floor-skimming dress as she was supported by 29-year-old Jack at Barker Hangar.

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Baby on the way: Jack Osbourne held pregnant wife Lisa Stelly's hand at Robert Downey Junior's 50th birthday party as she showed off her bump

Faithful husband Jack carried the birthday present in one hand and tightly gripped Lisa's hand with his other hand.

Kelly Osbourne's younger brother displayed a slight smile and was just recognisable beneath rounded shades, looking dapper in a red velvet blazer.

His elegant counterpart looked ethereal in emerald green and gold accessories to set off her copper hairstyle.

Cute couple: Jack held onto the birthday present with one hand and his wife's hand with the other

The Osbourne's and Jack's wife Lisa pose on the red carpet

Having announced their second pregnancy two months ago and debuted her bump on the red carpet at Oscars party in February, Lisa's shape was already blossoming.

Her two-tier dress hugged to her frame, just softened by a floaty top later that left her toned arms bare in the sun.

The couple are looking forward to welcoming a second child after sadly miscarrying their first son in September 2013.

Jack and Lisa were already proud parents to two and a half year old Pearl before sharing their news on Twitter with the words: 'Supprise!!!!! #round2 #babyinbound.'

Birthday boy: Downey Jr looked suitably eccentric in a pair of black and white shoes and white glasses

Party girl: Jennifer Aniston was among the stars to turn out for the movie actor's birthday bash at Barker Hangar

The boys: Jennifer's fiance Justin Theroux and actors Orlando Bloom and Jason Bateman wore all black

This weekend, Pearl's care was entrusted to 30-year-old Auntie Kelly, who appeared to be having a lovely weekend with her niece.

Taking to Instagram with a string of adorable shots, Kelly wrote: 'Thank you Pearl for reminding me just how fun Easter can be! #ProudAuntie'

And while former Fashion Police presenter Kelly was absent from the festivities, other a-listers who bagged an invite to the bash included Orlando Bloom and Jennifer Aniston.