Selena Gomez showed her sexy side in a tiny blue bikini on Monday, Sept 17.

The 20-year-old actress lounged poolside with her pals in a strapless aqua bikini top with matching bottoms.

In a series of photos taken by paparazzi, Gomez nonchalantly turned up the heat for the cameras when she laid on her back and shifted around in sexy poses as she spoke on the phone. Gomez was on break from filming one of her upcoming films.

View 10+ pictures of Gomez posing poolside in a bikini 

Gomez recently premiered her latest movie, "Spring Breakers," at the Venice Film Festival.

"Spring Breakers," directed by Harmony Korine, focuses on 4 wild friends who decide to rob a bank in order to pay for their spring break trip. 

Gomez plays a wild, bikini-clad party girl in the film which was considered a surprising choice for the squeaky clean actress. 

The singer, who recently released a commercial to promote her clothing line, is widely known for the lead role of Alex in the Disney show "Wizards of Waverly Place." 

"Obviously I know that coming from Disney Channel gives you kind of a brand in a way," Gomez said in Venice.

"People do put a label on you. I know that I have younger fans, and this is an opportunity for myself to kind of grow. It is a little shocking, I think, for the younger audiences ... but I think it was right for me," Gomez continued. "I did things I didn't even know I could do on the movie and I do think it was because I trusted Harmony."

"Spring Breakers" also stars Vanessa Hudgens, Ashley Benson, and Rachel Korine. 

The former Disney star who is dating Justin Bieber has reportedly been approved by his mother.

When Bieber's mother Pattie Mallette was asked on a recent episode on "The Ellen DeGeneres Show" what she thought of Gomez, she replied: "Seriously, how can you not like her? I mean you've met her. She's so sweet!" 

The 20- year-old is currently filming "Parental Guidance," set for release next year, and working on songs with Bieber for her upcoming album.