He's baaaack.

Former UFC Heavyweight Champion Brock Lesnar has reportedly arrived in Miami, Florida -- site of this weekend's WrestleMania 28 extravaganza -- and signed a one-year deal with WWE.

From the Wrestling Observer:

Brock Lesnar has arrived in Miami and arrived with security and a large group of people shielding him from everyone. This is the going story, but not confirmed, that Lesnar has signed a one year deal and will work a more than Undertaker and less than Goldberg type of schedule.

Upon hearing the reports, Ariel Helwani of MMAFighting.com asked UFC President Dana White if he was still okay with Lesnar signing with WWE this soon after his retirement from MMA back on Dec. 30, 2011, following his knockout loss to Alistair Overeem at UFC 141.

White simply responded by saying, "yes."

So it looks like all systems are clear and Brock Lesnar could be crashing the WrestleMania 28 party tomorrow night on pay-per-view. Stay tuned to MMAmania.com for any further updates to this developing story, as well as coverage of WrestleMania 28 tomorrow night.