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Selena Gomez, iHeartRadio Jingle Ball

D Dipasupil/FilmMagic

Selena Gomez keeps on slaying with her sexy looks!

The 23-year-old pop star killed it onstage at the iHeartRadio Z100 Jingle Ball at Madison Square Garden in New York City on Friday, both with her killer looks and performances of songs such as "Same Old Love," "Good for You" and "Love You Like a Love Song." She also reunited with collaborator and DJ Zedd to sing their track "I Want You To Know."

Gomez showed off her trim figure in a black velvet jumpsuit with lace panels running up the sides.

She also wore a semi-nude, lace mini dress over golden lingerie, paired with black vinyl thigh-high boots and a black and white plaid shirt tied around her waist.

 

Selena Gomez, iHeartRadio Jingle Ball

Mike Coppola/Getty Images for iHeartMedia

"SO grateful to wrap up this year with the best people," Gomez said on Instagram, calling Zedd her "babes." "Thank you NY!!"

The music artists had sparked romance rumors earlier this year but never confirmed a relationship.

Zedd posted a pic of the two looking cozy at the Jingle Bell and called Gomez his "favorite lil Mexican taco."

Selena Gomez, Zedd, iHeartRadio Jingle Ball

Kevin Mazur/Getty Images for iHeartMedia

Gomez arrived at the event wearing a strapless white over-the-knee shift dress, paired with black pumps.

Selena Gomez, iHeartRadio Jingle Ball

Andrew Toth/FilmMagic

Backstage, Gomez hung out with pop group Fifth Harmony, who also performed, and declared publicly, while hugging member Camila Cabello, that she's "Sixth Harmony."

Other celebrities who performed at the Jingle Ball, part of a nation-wide concert tour, included Demi Lovato, Nick JonasJoe Jonas's band DNCE, Hailee SteinfeldThe Weeknd and Shawn Mendes, who performed with Cabello their new duet "I Know What You Did Last Summer." Fetty Wap also took the stage and threw money into the audience.

Steinfeld also celebrated her 19th birthday that day.

"Happy birthday balls, - this time last year we were in ur hotel living room taking Polaroids, and today we played MSG," Cabello tweeted.

Nick, Cabello and Mendes were later spotted at an after party. The latter two were seen walking in together, E! News has learned.

Celebrity guests at the Jingle Ball included Chloe Grace Moretz, Modern Family's Ariel Winter and The Walking Dead actress Lauren Cohan, who stepped out with a new haircut.

—Reporting by Jennifer Cooper