Here's a look at some notable birthdays being celebrated today:

Susan Sarandon
Age: 67
Occupation: Actress and Activist
Known For: Her iconic role as Janet in 'The Rocky Horror Picture Show,' as well as roles the classic films 'Thelma and Louise' and 'Bull Durham,' winning an Oscar for 1995's 'Dead Man Walking,' her former longtime relationship with actor Tim Robbins, and being an activist for numerous social and political causes

Alicia Silverstone
Age: 37
Occupation: Actress
Known For: Her early appearances in Aerosmith's music videos, her movie role in 'Clueless,' and current guest starring  role on the TV show "Subergatory,' and making news for feeding her baby chewed-up food from her own mouth

Liev Schreiber
Age: 45
Occupation: Actor
Known for: Knocking up actress Naomi Watts -- twice, and being Sabretooth in 'X-Men Origins: Wolverine'

Rachael Leigh Cook
Age: 33
Occupation: Actress
Known For: Her roles as the geek-turned-prom queen in 'She's All That,'  and Josie in the movie version of 'Josie and the Pussycats'. These days she wears a badge and stars opposite Eric McCormack on TNT's 'Perception'