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Lady Gaga, Bruce Springsteen to Join Rolling Stones Onstage! Plus, American Country Awards' Big Winners and Other Must-Read News

by Alexis L. Loinaz and Bruna Nessif Tue., Dec. 11, 2012 5:16 AM PST

Rolling Stones, Bruce Springsteen, Lady Gaga

Kevin Mazur/WireImage, Jason Merritt/WireImag, Ethan Miller/Getty Images

Is it too much to hope for a mashup called "Edge of Glory Days"?

Lady Gaga and Bruce Springsteen are set to join the Rolling Stones onstage in what's gearing up to be a rock-pop summit of impressive proportions.

The two will be performing with the legendary rockers Saturday in Newark, N.J., to celebrate the Stones' final concert in their 50th-anniversary tour, per published reports.

The Black Keys are also set to take the stage at the concert, which wraps up a mini-world tour that included stops in Paris and London.

Yep, fans: Go get your satisfaction.

[Tune in at 8 p.m. ET/5 p.m. PT on Saturday to Live From the Rolling Stones, a one-hour special event covering all the preshow action from the Prudential Center leading up to the band's final performance of their 50th-anniversary tour—only on E!.]

Rolling Stones facing big fine for rocking past London curfew

Here's what else went down:

Country Music, Y'all: Last night was the 2012 American Country Awards! Check out all the highlights and winners' list here!

Gettin' Cheeky: As an early Christmas gift, Courtney Mazza posted a photo of her hubby, Mario Lopez, in tiny red briefs (and showing some butt cheek).

Haylor in the Way? It looks like the One Direction guys are getting a little annoyed at Harry Styles and Taylor Swift .

Hubba, Hubba: Kim Kardashian strips down to her negligee for Factice Magazine.

Big-Screen News: Tom Cruise's Jack Reacher reviews are out. A judge ruled to block Age of the Hobbits from being released. Benedict Cumberbatch's Star Trek villain has been (kinda) revealed.

TV Land: Get the recaps for The Voice and Real Housewives of Beverly Hills.

Get the big picture: Today's hottest pics!