Jennifer Aniston celebrated her 40th birthday with a lavish party on Saturday night. The former "Friends" star - who turns the landmark age on February 11 - celebrated four days early with a star-studded bash at her Beverly Hills mansion.

Jennifer invited close friends including Courteney Cox and husband David Arquette, Oprah Winfrey, Sheryl Crow, Tobey Maguire and wife Jennifer Meyer, Tom Hanks and Rita Wilson to join her and boyfriend John Mayer at the party.

Oprah Winfrey, Tom Hanks and Tom Cruise are among the stars who have sent their condolences to John Travolta and Kelly Preston.

The couple have been left devastated following the death of their 16-year-old son Jett, who passed away on Friday, but their friends have been quick to offer support.

Jennifer Aniston introduced John Mayer to her father and stepmother on Wednesday night. The former "Friends" actress - who has had an on-off relationship with the "Gravity" singer since the summer - met up with her father John and his wife Sherry Rooney Aniston at the exclusive Beverly Hills' Polo Lounge restaurant to debut her lover.

An onlooker said: "Throughout the whole of the dinner, Jennifer and John couldn't keep their hands off each other. Jennifer was constantly rubbing his hair and John was rubbing her back, then every so often they would steal a kiss.