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Michael Phelps, Entourage

HBO, Mike Stobe/Getty Images for EA Sports

Michael Phelps is taking one hell of a victory lap…around the TV dial.

Fresh off news that Phelps Phans will get their fix of the all-time Olympic champ next month as both a VMA presenter and Saturday Night Live host comes word that the Flipper-esque phenom will be making his premium cable debut later this fall with a cameo appearance on Entourage.

E! News has confirmed that Beijing's eight-time gold medalist shot a "spontaneous" cameo with the cast of the HBO hit in New York City earlier this morning. No further details on the episode or when it will be airing were available. The new season begins Sept. 7.

Let the battle of the Aquamen begin.

Phelps' Entourage cameo marked the one-man ratings machine's second time on camera this morning, the first being his guest spot on the Today show, ostensibly to celebrate his return to U.S. soil and promote his upcoming roster of other NBC appearances (next up: Jay Leno).

Guess the great haul of China was only the beginning for America's new golden boy.