Can't wait to see those goody bags! A source tells Us Weekly that Oprah Winfrey is planning a 60th birthday blowout in January -- and Julia Roberts, John Travolta, Tom Cruise and the Obamas are all expected to attend.

"It will be the party to end all parties," the insider says of the Colin Cowie-planned bash, which will be held at Winfrey's estate in Montecito, Calif.

The icing on the cake? Beyonce and Diana Ross may perform!

For more details on Winfrey's birthday bash, watch this week's Hot Stuff video, as explained by Us Weekly Entertainment Director Ian Drew and special guest Chanel Omari of Princesses: Long Island.

Also in the roundup: George Clooney hooking up with an ex; and much more!