Alias beauty Jennifer Garner walked onto the set of her latest movie unrecognised because her co-stars were expected a leather-clad super vixen! The 31-year-old actress, famous for her all action roles in TV's Alias and as Elektra in movie Daredevil, was almost ignored when she turned up to begin work on upcoming comedy 13 Going On 30. 'When I first turned up to meet her, I was expecting a girl to walk in wearing a leather bustier and some spikes and stuff and chopsticks in her hair,' says Garner hunky co-star Mark Ruffalo. 'And in walks this girl with a ponytail and no makeup and sweatpants, with a big huge smile on her face. I was like, 'God, who's that girl? Oh, it's Jennifer Garner!' She's nothing like she is in Alias and you quickly forget that she can kick your ass.' That said, Ruffalo had to work to resist the temptation to get to grips with his super-fit leading lady. 'There's been many times when I've wanted to put her in a headlock and I just thought maybe I shouldn't do that because she might kick my ass,' he adds.