RYAN'S RIDING HIGH – AND ALL ALONE

TV mogul chooses stardom and success over friends

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The busy host has driven away most of his old pals, a source says

RYAN SEACREST's old American Idol teammate and friend Simon Cowell reveals they no longer speak and insiders tell The National ENQUIRER he's not alone because the longtime host is self-obsessed and has driven away most of his old pals, earning him the crummy rep as Hollywood's loneliest celebrity.

Now also the host of the hit quiz show Wheel of Fortune, the 51-year-old began his rise to TV mogul at age 27 when he nabbed the Idol gig and now with his other successes is worth a whopping $500 million.