Details have emerged about the love nest that Justin Timberlake set up to ensure that Jessica Biel brought “sexyback” when he invited the actress to visit him in Park City, Utah for last week’s Sundance Film Festival.

The comfy couple chilled in his $1,950-a-night, four-bedroom condo at the Trail’s End Lodge in nearby Deer Valley, Utah.

“He called her and asked her to come,” says one of Biel’s tattling lackies.“And she was like, ‘What the hell? I’ll go!’ She is really spontaneous and fun.”

J.T and J.B went on a snowboarding excursion the next day at the Park City Mountain Resort.

“Jessica was in Sundance for a couple of days to see some movies,” is only former 7th Heaven kid’s rep will say.