They say that couples that play together stay together.

But it seems birthday girl fancied the idea of seeing in her big day with a sidekick as she ate out with a friend in Malibu on Tuesday.

And while the Transformers actress was tickling her tastebuds, her other half Brian Austin Green was busy running errands in Los Angeles. 

Happy birthday to her: Megan Fox celebrated turning 31 by going for lunch with a girlfriend in Malibu on Tuesday

Perhaps the 43-year-old self-styled actor was making a last minute shopping dash to buy a gift for his other half.

Megan, who has just turned 31, looked in fine form indeed as she pranced around in an opulent purple Middle Eastern-style silk overcoat, which she combined with a T-shirt and Beyond Yoga leggings.

And it seems she was not bothered about being another year older, as she grinned after handing her keys to her valet as she headed to the restaurant. 

While the sex kitten was on the prowl in Malibu, Brian was busy taking care of business in the Studio City area.

Giving him a birthday present: She handed over her keys to a helpful valet

Time for some cake: No doubt she was looking forward to tucking into her lunch

Happy days: She seemed thrilled to be spending some quality time with a chum

The Teenage Mutant Ninja Turtles: Out Of The Shadows star most recently had a son, named Journey, with Brian.

She is also a mother to two other boys, Noah, four, and Bodhi, three, with her husband of seven years.

As if that was not enough, she is also stepmom to Brian's 14-year-old son, Kassius, from a previous relationship.

They tied the knot in 2010 after six years of dating, however they separated in August 2015 and the actress filed for divorce a few days later.

However the following April, it was revealed that Fox was pregnant, with the happy couple reconciling and calling off the divorce.

Baron Green-back: Perhaps her husband Brian was looking for a present in Studio City

Foxy mama: Megan with her nine-month-old son Journey and eldest boy Noah