Ashton Kutcher, Mila Kunis and friends signed up for a Go Kart session in Los Angeles on Friday, February 15. The couple usually preferred quiet dinner date instead of public outing. However, it looked like they needed some changes to their routines. Ashton and Mila looked happy racing on the arena. At one point, Ashton successfully passed his girlfriend and was declared as the winner.

Ashton couldn't hide his grin after he passed Mila, with her trailing behind him shouting excitedly. The happy couple forgot to put on helmet before the race, but they wore it during break time after the race. Ashton wore his helmet first, then he checked Mila's to make sure it was locked properly.

Ashton, Mila, and friends spent a few hours in the Go Kart center. The couple was also seen talking to their friends and laughing.

It seemed that Ashton loved playing Go Kart. For his 35th birthday, Mila prepared a birthday celebration in a Go Kart racing center in California on February 9. She gathered Ashton's friends secretly and invited them to have a race with Ashton. Mila also prepared some snacks from their favorite fast food counter.

A source told US Weekly, "She went through so much effort to keep it a secret. He was genuinely shocked. After everyone yelled, 'Surprise!' he turned to Mila and kissed her. He was so touched. He kept looking at her and grinning (from) ear-to-ear. They had a great time."

Recently, Mila and Ashton were rumored getting married. An unnamed source told Hollywoodlife.com that Ashton "wants to and probably will marry" Mila.