Jason Priestley injured on set… Seth Rogen and Justin Bieber made up… Ed Sheeran plays beer pong… Rebel Wilson deals with the wrath of Kardashian fans… and Gavin Rossdale cheated on Gwen Stefani with the nanny

Jason Priestley was filming a scene for his new show “The Code” — he plays an ex-pro hockey player turned private eye, by the way — when he was thrown from a horse! Jason was rushed to the hospital where he was kept overnight for observation. He tweeted later that because of his history of concussions, he was taken to a neurologist for an assessment and advised to take a few days off work.

Seth Rogen must’ve cussed a little under his breath when he found out his appearance on “Ellen” coincided with Bieber Week. Seth has had some not-so-nice things to say about Justin’s behavior in the past, calling him a piece of (BLANK) and worse. He told Ellen yesterday, “I just called him some really mean things on social media for no real reason….I can’t tell you why I did it…And then it really hurt his feelings, as it should have.” Seth accepted full blame, saying, “It’s all my fault. It’s all just because I decided to be mean one day for no reason whatsoever.” But yesterday when they were backstage, Seth says he and Justin made up.

Seth Rogen’s Beef with Bieber

Ed Sheeran dropped out of school at 16 so he didn’t get to do the whole “college” thing. But he tried to make up for that in Chapel Hill, NC, Tuesday night when he and his girlfriend, Cherry Seaborn — a student at Duke — partied with some other college kids. They were spotted all over town, hitting up a bar called He’s Not Here. Later, they went to a frat party at the Lambda Chi house where Ed learned how to play beer pong.

Rebel Wilson is wishing she’d kept her mouth shut about the Kardashians. Rebel told an Australian radio show that she refused to present with Kendall and Kylie Jenner at the VMAs because she’s against everything the Kardashians stand for. And then she slammed Kim for being famous for a sex tape when Rebel actually studied acting. Well!! Not only did Rebel have to deal with the wrath of the Kardashians’ fans, even Oprah Winfrey stuck up for the family, saying they work insanely hard! And now Rebel claims she’s the victim of a smear campaign. She tweeted, “I’d be very happy to debate the Kardashians anywhere / anytime / any topic. Or maybe their publicist can just stop the smear campaign against me because I made one prompted comment about them on Australian radio?” Then she added, “In any event, I’m MORE than over this little thing and wish the K clan well X. Even sent them flowers.”

A source told “Page Six” that Gwen Stefani is relieved that the truth came out about her husband sleeping with the nanny. The source said, “No one likes to see the person dragged into the light like this, but in this case there’s a sense of relief people now know what she was dealing with.” “Us Weekly” reported that Gwen uncovered the 3-year affair when she found nude photos of nanny Mindy Mann on her son’s iPad, which was synched with Gavin Rossdale’s phone. And Gwen reportedly found out that Gavin even left her at the hospital after she gave birth to their third son, Apollo, so he could go sleep with the nanny!!