Julia Roberts, who was well-known to be the “Pretty Woman” star, celebrated her 41st birthday (which is actually on the 28th) a day early with a star-studded party in San Francisco.

The Hollywood actress, who was accompanied by her hubby Danny Moder, welcomed celebrity guests to a dinner party on the patio of Jardiniere Restaurant. Her celebrity guests included Tom Hanks and Rita Wilson, Bruce Willis, Jack Nicholson, Sean Penn and Robin Wright Penn, Billy Crystal, Danny Devito and Casey Affleck, who serenaded “Happy Birthday” to the Oscar winning actress.

Perhaps the event could be bittersweet for the group, who was in San Francisco to support the late Paul Newman fundraiser (planned months before his death) in aid of California camp The Painted Turtle at Davies Symphony Hall.

An eyewitness revealed that Julia’s birthday Party went well and lasted until the wee hours of the morning. Party guests finally started trickling out around 1:30 a.m.

A fellow diner revealed: “All the guests were in a good mood. Billy Crystal’s wife was a little nervous to leave the restaurant because a crowd had formed out front, but Billy told her, ‘Julia just left, we’ll be fine!’”

Brad Pitt has turned to his “The Mexican” co-star Julia Roberts for advice on raising twins.

The celebrity actor is set to become a father again when partner Angelina Jolie delivers twins in France, and reports suggest he has reached out to the “Pretty Woman” star for some expert advice.

A source revealed, “Brad [Pitt] was all frantic about knowing if the rules for twins are different than raising or taking care of single babies. But Julia told him it’s the same – only twice as hard.”

Angelina Jolie checked into a Nice, France hospital on Monday where she will remain until she gives birth. Julia Roberts gave birth to her twins, Phinnaeus and Hazel, three years ago.