Jessica Biel and Justin TimberlakeJustin Timberlake reportedly splashed out $60,000 on diamonds to accessorise Jessica Biel’s Versace gown at Monday night’s Costume Institute Gala.

Sources close to the pair claim he bought the I Now Pronounce You Chuck and Larry actress a diamond-encrusted Chanel J12 watch and Montblanc earrings for the event as a romantic gesture: “Their relationship hasn’t been as good as it could have been over the last few months and Justin’s determined to make it better.

“He splashed out on the bling to show his devotion.”

The couple have been dating since the start of 2007.