Ryan Seacrest assembles Lady Gaga, Coldplay, John Mayer and more for online concert

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One would likely need Ryan Seacrest‘s Rolodex to assemble a roster of superstars for a two-day, online streaming music festival -- so it’s probably best that the host has taken it upon himself to do just that.

Lady Gaga, Coldplay, Sting, Usher, Carrie Underwood, Nicki Minaj, John Mayer and the Black Eyed Peas are among those set to perform at the Las Vegas music festival Seacrest is spearheading with iHeartRadio.

Seacrest has also invited Jennifer Lopez, Steven Tyler, Kenny Chesneyand David Guetta for the digital to-do, set for Sept. 23-24 at the MGM Grand.

Lopez, from Seacrest’s ‘American Idol’ family, showed up on the ‘Today’ show Monday to join in announcing the event, with talk turning to another announcement folks are waiting to hear from her: whether she’ll as a judge on the Fox singing competition.

‘I have no announcement to make as of this moment, but I promise ... you’ll be the first to know,’ she teased.

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-- Matt Donnelly
twitter.com/MattDonnelly