Madonna had her phone confiscated at Jennifer Lopez's 40th birthday party

Madonna had her phone confiscated at Jennifer Lopez's 40th birthday party.

The singer and other celebrity guests, including Rihanna, Beyonce Knowles, Alicia Keys and Mary J Blige, were forced to hand over their mobile phones and any cameras before they were allowed into New York's Hotel Griffou to celebrate with Jennifer.

The strict rules angered some partygoers, but Madonna and Rihanna reportedly used the increased privacy to dance "exuberantly" to Rob Base and DJ EZ's hit 'It Takes Two'.

Jennifer spent most of her landmark birthday working on the set of her upcoming film 'The Back-Up Plan'.

When shooting wrapped for the day, the cast and crew presented her with a cake and flowers before husband Marc Anthony arrived to whisk her away to the surprise party.

Jennifer looked stunning in a slinky silver dress as she posed for photos outside the event, and Marc couldn't keep his hands off his wife.

The Latin singer and Jennifer have 17-month-old twins Max and Emme together.