Justin Bieber is now the new face of Calvin Klein underwear. What does on-and-off girlfriend Selena Gomez think about his latest ad campaign?

According to HollywoodLife.com, Gomez is not happy about Bieber's new modeling gig because she thinks he make his music career his priority.

"Selena is not impressed with Justin's big announcement," an insider said. "She thinks he's getting attention for all the wrong reasons. Selena thinks it's flattering to be a Calvin Klein model, but Justin should be focusing on his music, on his writing. He used to tell Selena that music was his world, but for over [a] year now Justin has been getting attention on anything but his music. Selena feels like he needs some mentoring on his priorities!"

The "The Heart Wants What It Wants" singer has admitted to her friends, however, that she is "still totally attracted" to her ex and thinks "he looks smoking hot" in his shirtless images, according toHollywoodLife.com. 

A source also claimed dating a Calvin Klein model was Gomez's fantasy growing up.

"When Selena was a kid, she had CK model posters on her wall. She even wistfully dreamed about dating one. Now her ex has become one. Despite still having heartache and pain over Justin, Selena is kicking herself for thinking he's so incredibly hot," the source said.

In addition, Gomez is reportedly jealous of Holland model Lara Stone, who is seen cozying up with Bieber in the new Calvin Klein ad campaign.

"She thinks Justin looks hot in those pictures, and that's hard," another source said. "There's a big part of her that still wishes she was the one with him so seeing him star in a sexy underwear campaign with another girl draped on him sucks."

The Canadian star took to his Instagram account on Jan. 6 to show off his chiseled body in several snapshots:

The next day, Bieber shared a teaser and more photos of him sporting underwear via Instagram.