Justin Timberlake forced girlfriend Jessica Biel to down shots of alcohol at the weekend, femalefirst.co.uk reports.

The pop heartthrob and the actress were guests at two separate birthday parties on Saturday night, both held in Los Angeles’ Thompson Hotel.

A few hours into the evening, Biel, 27, was ready to ditch alcohol for soft drinks, but 28-year-old Timberlake wanted to carry on drinking alcohol.

One fellow reveller told the New York Daily News newspaper: “Everyone was downing shots of tequila, but Jessica said she didn’t want to drink anymore. Justin good-naturedly insisted, so she pulled her hair back and drank up.”