Published: 02:29 BST, 21 April 2015 | Updated: 08:51 BST, 21 April 2015
Malin Akerman shared an Instagram photo on Monday from a pool party she held to celebrate her son Sebastian's second birthday.
Noting that there was no shortage of beautiful bikini-clad women surrounding her, the Watchmen actress jokingly captioned the snap: 'Who feels sorry for this birthday boy...?!'
The 36-year-old posed with her boy alongside Mission Impossible: III actress Michelle Monaghan, model Jennifer Johanna Akerman - who is her younger sister, The Big Gay Sketch Show's Nicol Paone and Entourage's Emmanuelle Chriqui.
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Birthday boy! Malin Akerman shared an Instagram photo on Monday from a pool party she held to celebrate her son Sebastian's second birthday
For the celebration, Malin had on a simple black bikini that she complemented with aviators.
To her side stood The Borgias star Emmanuelle, 37, whose famous figure was highlighted by a teal bikini.
And striking a pose on the other side of Malin was Golden Globe-nominated actress Michelle, 39, whose colorful bikini top captured the attention of the birthday boy.
Beautiful company: The 36-year-old mother-of-one posed alongside her showbiz freinds; from L-R, Entourage's Emmanuelle Chriqui, Malin Akerman, Mission Impossible: III actress Michelle Monaghan, model Jennifer Johanna Akerman - who is Malin's younger sister and The Big Gay Sketch Show comedic-actress Nicol Paone
Malin's resemblance to her sister Jennifer was unmistakable in the photo as the blonde model posed in a black bandeau top. Her younger sibling shared a similar snap on her Instagram page, calling the day 'amazing.'
Comedienne Nicol, 44. was in a retro polka dot bikini and added a playful touch to her look with a pirate's hat.
Sebastian officially turned two years old on April 16, and the Swedish Canadian actress shared an image of her little man playing with a balloon animal on his big day in New Orleans.
In the caption she reflected on how motherhood has made her a better person.
He's growing up! Sebastian officially turned two years old on April 16, and the Swedish Canadian actress shared a snap of her little man playing with a balloon animal in New Orleans
Proud mother: In a photo caption she reflected on how motherhood has made her a better person
'Sebastian, two years ago you came into this world and changed my life for the better. You have taught me patience, presence, delight, and of course the truest form of love there is,' she wrote in her Instagram post.
'You grow me into a better person each day and so I want to thank you and celebrate you for the wonderful little soul that you are. I love you to the moon and back! Happy 2nd Birthday!!! #letthemeatcake #happybirthday #love #family.'
Malin shares custody of her son with her ex-husband, Italian drummer Roberto Zincone.
Busy single mom: Malin shares custody of her son with with ex-husband, Italian drummer Roberto Zincone; seen above she posed at the premiere of The Final Girls in March at the SXSW Festival in Austin, Texas
The former couple of 10 years met in 2003 when they were in the alt-rock band Petalstones and married in Italy in 2007. The entertainers split seven months after their son was born.
Roberto filed divorce documents a day before the Thanksgiving holiday in 2013, TMZ reported at the time.
Malin has not spoken publicly about her divorce, however her Sin City Saints co-star Tom Arnold expressed his outrage at her ex-husband while speaking to Howard Stern on his SiriusXM program.
Four-times-married Tom praised the single mother for remaining dignified following an unfavorable financial support outcome, he said.
He told the satellite radio host: 'She's a single mom. Her deal - and I probably shouldn't talk about her - but... I have so much respect for her. She is such an amazing woman. You know, her husband, they're together 10 years, they have a baby, [and] four months in, he's like, "I'm done."
'So, she not only pays him alimony to take care of this guy, but I watched her as a mother, and I was like, "This is the most inspiring woman. I'm not gonna complain about anything in my life." Because she is incredible,' he said, adding, 'She is an inspiration.'
Ball buster: In Sin City Saints - a Yahoo web-streamed comedy series - she plays NBA executive and attorney Dusty Halford, opposite casino host Tom Arnold, who is tasked with saving the new Las Vegas basketball team
In Sin City Saints - a Yahoo web-streamed comedy series - she plays NBA executive and attorney Dusty Halford, opposite casino host Tom Arnold, who is tasked with saving the new Las Vegas basketball team.
The program debuted on March 23 with all episodes available on Yahoo for binge-viewing.
Meanwhile, Malin's Cartoon Network series Children's Hospital is now in its sixth season season. In the comedy she stars alongside Lake Bell, Megan Mullally and Henry Winkler.