Hayden Panettiere has sparked rumours of an alleged affair after she was spotted with National Football League star Scotty McKnight.The 21-year-old star, who announced the end of her two-year relationship with Ukrainian boxing champ Wladmir Klitschko last week, stepped out in West Hollywood with McKnight, 23, reported a US magazine.The rumoured couple, who were seen sharing meal at Mel”s Diner, also spent Memorial Day together in Laguna Hills, California with a mutual pal.”I”m a huge Jets fan and became very good friends with Mark and his buddies. I”ve always been that girl who has a lot of dude friends. I”m into sports so we have a lot in common,” Panettiere told