Courteney Cox showed up to the Late Show with quite the support system in place.

Snow Patrol rocker Johnny McDaid had his arm tucked firmly around his girlfriend's shoulders as he accompanied the Cougar Town star to the Ed Sullivan Theater for her sit-down with David Letterman, airing tonight.

And Cox, we must point out, looked downright hot.

The 49-year-old actress was killin' it in a tight cobalt-blue dress with a plunging neckline that showed off a fair amount of cleavage. Someone's ready for bikini season...

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