The "Heroes" actress - who plays self-healing cheerleader Claire Bennett in the hit TV show - donned a special raunchy cheerleader outfit and treated her co-star, who turned 31, by gyrating in front of him, before whipping off the costume to reveal sexy red lingerie.

A source said: "Hayden gave Milo an unforgettable birthday surprise by morphing from her bouncy cheerleader character in 'Heroes' to a bump-and-grind striptease.