Will Ferrell and Heidi Klum were left rather embarrassed at a photoshoot. The comedian’s wife turned up at the worst possible time, as he was biting the supermodel’s butt.

Currently doing promotional duties for his new film Semi-Pro, Ferrell modelled with Klum for the annual swimsuit edition of magazine Sports Illustarted.

The pair got a little carried away however, just as the actor’s wife Viveca Paulin walked into the studio.

He recalls: "My wife walked in right at the moment when I was biting Heidi's butt. But she is incredibly accepting of all these things. She just rolled with it."

Maybe she’s hoping to be included in Will’s next fun frolic with a supermodel.

Click here to see if Heidi Klum made our gallery of the Best & Worst Celebrity Butts.