PIC: Carrie Underwood Shows Off Bikini Bod on Honeymoon

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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 UsMagazine.com.

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."