She won't confirm rumors that she's dating Nick Jonas, but Selena Gomez has no problem confirming her passion for the Jonas Brothers' new album on YouTube.

The Wizards of Waverly Place star, 16 – alongside her co-star, David Henrie – created a YouTube video encouraging fans to buy the Jonas Brothers' third studio album, A Little Bit Longer, which debuted on Tuesday.

"Guess what comes out today?" coos the singer in the clip. "The best album of 2008 – besides Demi Lovato's that comes out in September – the Jonas Brothers!" (Lovato is Gomez's best friend and also starred in Camp Rock with the fraternal trio.)

"If you already bought it, buy another one. And if you've already bought another one, get another one after that," Gomez continues, while intermittently humming and singing the album's first single, "Burning Up," along with Henrie. The video then cuts to crew members from the Waverly Place set cheering as Gomez implores them to buy the album.

What could be behind the actress's motivation? A source confirmed to PEOPLE last month that Nick, 15, and Selena have been "dating for months," but both Gomez's and the Jonas Brothers' reps deny a romantic relationship. Nevertheless, Gomez's persistence appears to be working: After the success of "Burning Up," their second single, "Tonight," debuted at No. 8 on the Billboard's Hot 100.