Shania Twain at Ultra?

Shania Twain incognito at Ultra.
Shania Twain incognito at Ultra.

The most random and unexpected Ultra Music Festival celeb sighting award goes to Shania Twain, who posted a picture of herself on social media looking completely unrecognizable in a baseball hat at the downtown Miami music fest.

P. Diddy hosted a weekend-long pool party celebrating Ultra last week at his Star Island estate. The annual event was private and had a strict “No Cell Phone” policy. Guests included Wiz Khalifa, Paris Hilton, French Montana, NBA star Kyrie Irving and Diddy’s on-again gal pal Cassie.

Curtis “50 Cent” Jackson was spotted dining solo Monday at Mondrian South Beach’s brand new pop-up restaurant Hurao. Afterward he headed to Rockwell, where he performed a slew of hits including Questions, Ayo Technology, Candy Shop and Baby by Me. Fiddy surprised guests by having Wiz Khalifa join him on stage to perform two songs. The two were later seen hanging with friends, enjoying “parades of Effen Vodka” delivered to their table.

Reggie Bush and his wife Lilit Avagyan were seen Saturday at the SiriusXM Music Lounge at the 1 Hotel South Beach.

After knee surgery in February, Roger Federer is back in Miami for the Miami Open and was seen Tuesday having dinner with friends including tennis player Ivan Ljubicic at Juvia.

More tennis players spotted around town: Andy Murray, Santiago Giraldo, Guido Pella, Pablo Cuevas, David Marrero, Nicolas Massu and Rafael Nadal, seen at different times last week at Novecento Brickell. On Wednesday, Bulgarian tennis star Grigor Dimitrov had dinner with his mother at La Mar by Gaston Acurio.