Wladimir Klitschko and Hayden Panettiere
02/20/2013 AT 04:00 PM EST
Are Hayden Panettiere
and former flame
Wladimir Klitschko back on?
The duo was spotted together enjoying lunch at Taco Beach Shack in Hollywood, Fla., on Monday, an onlooker tells PEOPLE.
"Hayden had two grilled mahi mahi tacos and a margarita while Wladimir had six mahi mahi tacos and a coke," the source says.
After lunch, the Nashville star
– who was dressed casually – removed her brown leather jacket to play table tennis on the restaurant's ping pong table.
Champion boxer Klitschko gave Panettiere a few pointers and "wrapped his arms around her from behind to show her his own style of hand and eye coordination," the source adds.
As the pair exited the restaurant, a generous Klitschko left a "$20 tip on a $20 tab."
– Linda Marx