"Recently I've spent a lot of time with Cyndi Lauper, and she's a legend," says Meester. "She gave me the advice: Never sell your publishing, so I'll take that."
The thrill of the stage has Meester – who's worked with Lil Wayne, Robin Thicke and Adam Lambert – hooked.
"I get more excited than nervous, and I feel like that's the best kind of energy to have," the TV actress, 23, told PEOPLE Saturday before a 15-minute gig at Venetian's Tao Las Vegas. The performance, she says, is "cute, sexy ... I'm just having the time of my life, and I hope it continues." (See her video with Thicke here.)
Meester began her electro-pop set with the Cobra Starship song "Good Girls Go Bad," then followed with "Somebody to Love," "Playing Games" and "Your Love’s a Drug."
After the performance, she headed to a sky box table in the moat overlooking the entire club, to celebrate her last night before heading back to the Gossip Girl set. Earlier in the evening, Meester, the band, dancers and crew dined at LAVO for an Italian feast.
And since performing live doesn't frighten her, what does give Meester pause? Her brother's driving.
"He's 16, so I get worried," she said.