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

    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!