Selena Gomez 'Revenge Dress' Post Justin Bieber Split; Plunging Neckline & Lots of Leg

Selena Gomez stepped out in a dress with a plunging neckline only days after reportedly breaking up with Justin Bieber and reports dubbed the revealing outfit her "revenge dress" over the couple's split.

The former Disney star wore a blue Alberta Ferretti cleavage-baring dress with bedazzled pumps at Chateau Mormont on Jan. 19 at a Vogue benefit dinner and fashion show. She posed with late night talk show host Chelsea Handler in one image that showed off the dress' asymmetrical hem.

Gomez, 20, and Bieber, 18, were spotted in Utah on a ski vacation with Harry Styles and Taylor Swift before the Christmas holiday. An onlooker saw them kissing and cuddling in a Salt Lake City airport before they flew back home separately to spend the holiday with their family. Then for New Year's the couple took a trip to Puerto Vallarta in Mexico and onlookers saw them arriving together at a local airport on Saturday, Dec. 29.

However, they reportedly got into a fight during their vacation that was big enough to end their relationship and Gomez flew back home to Los Angeles on Dec. 30, where she rang in the new year with friends and family.

"The two of them flew to Mexico for New Year's Eve, but had a blow-out argument on December 30 and broke up," a source confirmed to TMZ. "Selena left Mexico that same day and Justin left for L.A. on the 31st.

"They had another huge fight, and Selena won't forgive him," a source told Us Weekly. "'Selena is done with him."

A different source told HollywoodLife.com that Gomez went to a party in Puerto Vallarta after the fight and told partygoers that Bieber said mean things to her during their argument, such as, "Don't let the door hit you on the way out."

After more than two years of being on and off, the couple has reportedly parted ways but Bieber is not giving up: he is desperate to get Gomez to forgive him and take him back.

"Justin is calling her 100 times a day and she's not picking up," an insider said.