Selma Blair shows off her toned arms in white vest top as she ferries son Arthur to Pink's daughter's birthday party

By John Lawson

Published: 21:30 EST, 1 June 2014 | Updated: 21:32 EST, 1 June 2014

Her son Arthur is turning three next month but he already has a busy social calendar.

And Selma Blair is ready to make sure he doesn't miss out on anything.

The 41-year-old doting mother displayed her toned arms in a white vest top while carrying her little man to a party celebrating Pink's daughter Willow's birthday in Malibu on Sunday.

Staying fit: Selma Blair revealed her toned arms while carrying son Arthur to Pink's daughter's birthday party in Malibu on Sunday

Staying fit: Selma Blair revealed her toned arms while carrying son Arthur to Pink's daughter's birthday party in Malibu on Sunday

The Hellboy star wore billowy stripped cropped pants with a gauzy white top with blue accents at the top of the sleeves which she later removed to reveal her lean limbs in a white vest top.

At one point the tank rolled up a bit to flash her gym toned trim tummy.

In keeping with the warm afternoon, she donned a pair of Birkenstock type sandals and carried a bright red tote.

Selma wore her dark tresses loose to her shoulder with her bangs slightly tussled, little make-up and a pair of sunglasses to block out the glaring sun.

Slender figure: The 41-year-old stayed cool in her white vest top and colourful stripped pants

Slender figure: The 41-year-old stayed cool in her white vest top and colourful stripped pants

Adorable: Little Arthur turns three next month but was ready to have fun at his friend's party

Adorable: Little Arthur turns three next month but was ready to have fun at his friend's party

She carried her bundle of joy in her arms, who looked adorable in a pink shirt and blue checked shorts.

Little Arthur appeared a bit restless in her arms, but she held him close as they made their way to the celebration.

The party was for pop star Pink's daughter Willow, who turns three tomorrow.

Bohemian: The Hellboy star wore a white billowy top over the tank and hid her gaze behind dark sunglasses

Bohemian: The Hellboy star wore a white billowy top over the tank and hid her gaze behind dark sunglasses

Casual: The Birkenstock type sandals gave the ensemble and even more laid-back touch
Casual: The Birkenstock type sandals gave the ensemble and even more laid-back touch

Casual: The Birkenstock type sandals gave the ensemble and even more laid-back touch

Selma recently completed shooting her latest movie Sex, Death And Bowling co-starring 24 star Mary Lynn Rajskub, Sopranos beauty Drea de Matteo and Entourage's Adrian Grenier.

The dramatic film - directed by actress Ally Walker -- deals with two estranged brothers who come together after one is diagnosed with terminal cancer, it is expected to be released sometime in 2015.

With her downtime, the single mom has been enjoying most of her days with her son, who turns three on July 25.

Selma broke-up with little Arthur's father, fashion designer Jason Bleick, in 2012.

Busy actress and mother: She recently wrapped filming the movie Sex, Death And Bowling and is now enjoying spending lots of time with her son

Busy actress and mother: She recently wrapped filming the movie Sex, Death And Bowling and is now enjoying spending lots of time with her son

Birthday girl: The party was for Pink's daughter Willow who turns three on June 2nd, pictured here in December 2013

Birthday girl: The party was for Pink's daughter Willow who turns three on June 2nd, pictured here in December 2013

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