American Idol runner-up Adam Lambert has ruined his budding career by coming out as gay, according to rock legend Gene Simmons.

Lambert ended weeks of speculation by declaring his sexuality just days after he lost the 2009 show finale to Kris Allen. Simmons insists he should have kept the information to himself, because his homosexuality will now overshadow everything he ever does.

The Kiss star tells AOL, "He killed his career because now the conversation is not about his talent but about his sexual preference. He's done.I hope I'm completely wrong. I hope he becomes the next Beatles and proves me wrong."

It's not all bad news for Lambert - Simmons recently invited him to join his band on tour, telling reporters, "Adam was fantastic. What a powerful and attractive man he is. He can come on tour whenever he'd like."

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(This news article provided by World Entertainment News Network)