Cocktail is the story of a hilarious and dramatic summer in the lives of three people in a foreign land who inadvertently become best friends until love comes to town! When Gautam (Saif Ali Khan), Veronica (Deepika Padukone) and Meera (Diana Penty) start living together in London, they make for an unlikely threesome. Meera and Veronica are best friends. Gautam and Veronica are in a casual relationship. Meera hates Gautam and he loves this. All is well until love happens... with all its complications. Can their friendship handle it or sometimes are good friends just too good to be shared?