Selena Gomez really treated her fans in Panama. In addition to having them choose her outfit, she also put on one heck of a show! Not only did the starlet perform her own hits, she also covered the 2011 Alexandra Stan smash 'Mr. Saxobeat.'

Gomez implored her fans via Twitter to help her choose which sparkly get up to don at her show. "Which one should I wear tonight? #WOTsouthamerica I'm only supposed to wear one but I want both!" Tough life, Sel!

She wound up donning the sassy, sexy red number for her show. The Panama concert was the first stop on Gomez's 'We Own the Night' South American tour. "Thank You Panama for an amazing welcome to South America, what a great crowd. #WOTNSOUTHAMERICA," Gomez tweeted.

Prior to Panama, Gomez performed in Puerto Rico to kick off her tour -- but Puerto Rico technically isn't in South America. While in Puerto Rico, fan admiration wasn't the only kind Gomez took in. She also went on a hot date with boyfriend Justin Bieber!

Gomez has a packed schedule ahead of her. Once her tour winds down, she has her burgeoning movie career to keep her busy. She's starring in Harmony Korine's edgy 'Spring Breakers' film as well as 'Hot Mess,' in addition to producing and starring in a remake of 'The Sky Is Everywhere.' She also has a UNICEF trip planned where she'll be heading to the Democratic Republic of the Congo. Phew! We got tired just reading that.

Watch Selena Gomez Perform 'Mr. Saxobeat' Live in Panama