Singer Justin Timberlake proposed to actress Jessica Biel in Rome last week, said the London Sunday Mirror. The couple was sightseeing after flying in for the wedding of Biel’s former 7th Heaven co-star Beverly Mitchell. The 27-year-old Timberlake, who previously has dated Cameron Diaz and Britney Spears, got down on one knee to propose to Biel, 26. A source told the newspaper that Timberlake is “besotted” with Biel, and that she is “over the moon and looking forward to a huge wedding” in the next 18 months.