No, you're not seeing double. There are now two Pettises in the UFC.
Sergio Pettis, the 20-year-old younger brother of UFC lightweight champion Anthony "Showtime" Pettis, has signed with the organization.
The Milwaukee native has been fighting professionally for two years. He's 9-0 with three knockouts and three submissions, and he held the Resurrection Fighting Alliance flyweight title.
His most recent victory was on Sept. 28, where he scored a first-round victory via Kimura over James Porter.
Update: UFC officials confirmed Pettis will be fighting at UFC 167, and he will be fighting Vaughan Lee.