A Very Happy Birthday to ...

One stars on Heroes and many a teenage fantasy.

One shot her married boyfriend's wife in the face.

One hooks up with many dudes and has a famous singer for a dad.

One hooks up with many chicks and has an Olympic gold medalist for a dad.

Can you guess today's celebrity birthdays? Follow the jump to find out who's turning another year older (and most likely not wiser) today ...

Happy birthday to Hayden Panettiere (19), Brody Jenner (25), Kimberly Stewart (29) and Amy Fisher (34)! Did you guess correctly?

Either way, enjoy (and click to enlarge) some photos of today's birthday girls (and boy). It's a mostly attractive foursome ...