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Hunky Mark Salling looks mighty worried as he cruises through LAX after arriving from London. He and his Glee castmates appeared on the UK's X Factor singing Journey's Don't Stop Believing, and some are accusing the stars of lip-syncing during their appearance. Say it isn't so! Check out the performance below. What do you think?



We're not sure why Mark looks so concerned because his co-star, Cory Monteith, tells our X17 videographer, "I wish we didn't have to rehearse for hours and hours and we could just lip-sync."

Mr. Salling tells us he can't wait for Katy Perry's upcoming Glee appearance. We can't either!