Yesterday afternoon, the Mets third baseman was in room 602, which was labeled for Guest Dressing. Later he would head over for makeup. Then he hung out in the Green Room.

The All-Star was getting ready for The Late Show … with David Wright.

Wright, the 23-year-old Mets star, appeared on “The Late Show with David Letterman” last night for the first time in his career. Wearing a silver suit and a blue shirt, Wright had a good time in the Ed Sullivan Theater.

“Fun [so far]. As a kid, or not as a kid but even now, you watch the ‘Late Show,’ ” said Wright, sitting on a couch in the Green Room before his appearance. “You get a chance to come on now and be a guest. It’s almost surreal that you go from watching it, being a fan of the show, to getting to participate.”

Wright flew in the previous night from Pittsburgh, where he homered off Kenny Rogers in Tuesday’s All-Star Game. He headed over to the studio yesterday in a limo provided by the program.

Waiting to go on, he spent time in the 602 room – which featured a couch, a mirror, a TV, some bottles of water and soda, cookies and fruit, etc. – hanging out with his agents and their families. He signed autographs and did an interview with CBS.

Wright was set to take some batting practice outside, too, but thanks to bad weather, it was canceled.

Before his appearance, Wright got makeup – “They said I didn’t need it,” he quipped when asked about the experience – and admitted he was “a little bit” nervous.

The jitters went away soon after he went on, he said later.

Stage manager Biff Henderson summoned Wright from the Green Room after the first guest, Denis Leary, was finished, and Wright headed out to chat with Letterman.

He gave a wave, and Letterman began a 7-minute conversation with the questions about such things as playing ball as a kid. Letterman also asked Wright about Willie Randolph, whom the player called “the best.” Letterman showed photos of Wright’s tongue hanging out while playing. The host jokingly asked about biting part of it.

“It’s something that I’m very concerned about,” Wright said. “Obviously, your tongue is important to you.” To which Letterman replied, “Especially on the road.” Wright didn’t seem rattled, coming across as relaxed.

“It was great. It’s almost like the butterflies and the nervousness go away once you step in there and you hear the crowd,” Wright said. “The crowd was, they were very warm in greeting me. So that almost goes away. And then when you get up there, it’s a very intimate atmosphere.”

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Everything’s going Wright

Mets third baseman David Wright has enjoyed an incredible week – from late-game heroics to a stellar showing at All-Star Game events. Here’s a look at his strong week thus far:

Sunday

Hit three-run homer in eighth to cap fourrun inning as Mets rally to beat the Marlins, 7-6.

Monday

Led all contestants with 16 HRs in Round 1 of the Home Run Derby. Finished second, losing to Phillies’ Ryan Howard by a single HR.

Tuesday

In first ever All-Star Game at-bat, ripped game-tying solo home run in second inning.

Last night

Made appearance on “Late Night with David Letterman.”