It has recently been reported that Justin Bieber apparently is jealous of his ex-girlfriend Selena Gomez's new relationship with bisexual supermodel Cara Delevingne.

Gomez and Delevingne sparked dating rumors, as they were spotted together on a vacation last week. The pair spent a week in Saint-Tropez, celebrating the "Come & Get It" singer's 22nd birthday. They also attended the Leonardo DiCaprio Foundation Gala, which was held at Domaine Bertaud Belieu.

After enjoying their highly publicized time in France, the couple arrived at LAX in Los Angeles on July 24. They were once again photographed together leaving the airport, while Gomez had a red rose to her chest.

Since the "Tell Me Something I Don't Know" singer and the Victoria's Secret Angel seem to be more than friends, many have wondered if Delevingne has replaced "Fast & Furious" actress Michelle Rodriguez, who she dated back in February, with Gomez -- including Bieber.

According to Daily Star, the Canadian pop star is concerned about the couple's relationship. He reportedly drunk-dialed the British model to ask what her relationship status with his former lover is. "Justin has called Cara on more than one occasion, wanting to know what's going on," a source revealed. "It's been clear that he's had a drink beforehand, too."

Luckily for the "Baby" hitmaker, there is nothing serious going on between the two beauties. "Cara is unfazed by the situation though. She's just having fun with a new pal," the source added.

However, there is someone else that Justin Bieber should be worried about -- Italian hunk Tommaso "Tommy" Chiabra, who joined Selena Gomez and Cara Delevingne on vacation. The founder of the Royal Yacht Supplies Company was pictured having a ride on a jet ski together.