New York, July 24 - Singer-actress Jennifer Lopez will celebrate her 40th birthday with a spectacular bash here.

Lopez turned 40 Friday and a star-studded event is being planned on Saturday night to mark the milestone, reports contactmusic.com.

A number of A-list stars including Tom Cruise, Katie Holmes and Victoria Beckham are expected to jet into the city to help Lopez welcome her 40s. The party is expected to include performances and dancers have been auditioned all week for the do.

'Everything is being kept top secret. Even performers won't be told if they have been hired until the last minute, to prevent details of the party from being leaked,' said a source.