Timberlake, Jessica Biel 'engaged'

THEY'VE been on and off, on and off but are Justin Timberlake and Jessica Biel really on again?

Like really on? Like getting married?

Us Weekly says yes, announcing in its latest issue that it had been told by "several insiders" that the couple of four and a half years became engaged in late December in Jackson, Wyoming.

According to the magazine, Timberlake, 30, a six-time Grammy winner, chose the locale because the 29-year-old Biel loves snowboarding and the mountains.

Another insider claimed Timberlake had "never been happier he knew it was the right time to propose."