Renee Zellweger and George Clooney — who dated years ago — were huddled together in a corner of The Dorchester hotel, knocking back champagne cocktails until 5am.

After being thrown out by the barman so he could close up, the pair went giggling down a corridor clutching a bottle of champagne, back to a private hotel suite.

Famous celebrity couples :

• Jennifer Aniston & Vince Vaughn


• Jules Asner & Steven Soderbergh


• Ciara & Bow Wow


• Beyonce Knowles & Jay-Z


• Sheryl Crow & Lance Armstrong


• Cameron Diaz & Justin Timberlake


• Calista Flockhart & Harrison Ford