Guess she really needed some SexyBack into her life!

As reported in the new Us Weekly, Jessica Biel reunited with Justin Timberlake in a big way over the past couple weeks: Brunch and cycling in Toronto, lolling about in Martha's Vineyard and the Hamptons and chilling in NYC.

"They seemed happy together," a Toronto witness says of the pair, who broke up after nearly 4 years in March amid rumors of his infidelity.

What made Biel, 29, take back the singer-actor, 30?

Find out in this week's Hot Stuff video, as explained by Senior Editor Ian Drew and special guest, country star Jake Owen.

Also in the roundup: Emma Stone is creeped out by Jim Carrey's recent video message dedicated to her; which Bachelor Pad 2 star wants her own spinoff; George Clooney and Stacey Keibler still going strong, and more.

Watch the clip now!