Isla Fisher was joined by her celebrity friends at a cooking class to celebrate her birthday.

The pregnant 'Confessions of a Shopaholic' star turned 39 on Tuesday (03.02.15) and marked the occasion with a tutorial at EATZ Los Angeles, for which she was joined by husband Sacha Baron Cohen - with who she has daughters Olive, seven, and four-year-old Elula - Courteney Cox, Naomi Watts and Liev Schreiber.

A source told Us Weekly magazine: ''It was a small group. It was a very hands on class with unlimited alcohol.

''Everyone had a really fun time, it was a great group. They ran out of champagne so someone went out to get more.''

The group learned to cook four courses, including appetisers, fish and Isla's favourite ''fruit-based'' dessert.

After making the final course, the group sang 'Happy Birthday' to the Australian beauty and she blew out the candles on the dessert.

It was recently claimed the 'Great Gatsby' star has been having a tough time with her third pregnancy and has been feeling very tired.

A source said: ''Isla's exhausted. Sacha helps, but she's been finding this pregnancy her toughest yet because her daughters are so active.''