Over the weekend, many wondered if the big announcement that Jennifer Lopez was promising to reveal on Monday would deal with her return to American Idol. It didn't.

The judgess/singer announced that she is taking part in the I Heart Radio inaugural concert. "Me, Lady Gaga, Alicia Keys, Coldplay, Steven Tyler, Carrie Underwood, Steven Tyler, Black Eyed Peas," J.Lo said while about the line-up. "So many people. It's going to be this amazing concert in Las Vegas on Sept. 23 and Sept. 24 to launch the new I Heart Radio, where you can kind of custom your own radio station. It's pretty exciting. I'm glad to be doing it."

And what about Idol? Lopez was tight-lipped, but don't expect that to last long. "I love working on American Idol," said Lopez. "I have no announcement to make as of this moment, but I promise you guys will be the first to know."

[via USA Today]