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Looking good, Mrs. Fisher!

Carrie Fisher -- nee Underwood -- frolicked in the Pacific Ocean off Tahiti with new husband Mike Fisher Monday.

The two -- who said "I Do" in a lakeside ceremony near Atlanta over the weekend -- were spotted arriving to their luxe resort sipping cocktails. The dressed-down American Idol winner, 27, wore flowers on her head.

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The Saturday ceremony "was gorgeous," a waiter who worked at the bash, held at the Ritz Carlton Reynolds Plantation in Greensboro, Ga, tells

The more than 200 guests feasted on "Southern" food and cupcakes. "It was a big party!" added the server.

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Despite the reported $500,000 price tag, the event was "down to earth... it wasn't really flashy," just like the bride and groom and their pals, none of whom, "had a trace of attitude," the insider said. "Everyone was super friendly."

"It wasn't one of those crazy weddings you hear about in Hollywood," another witness told Us. "It was a nice party for a nice couple."