Article continues below advertisementTaylor Swift celebrated her best friend Selena Gomez's 33rd birthday with a glamorous soirée that radiated '70s disco vibes. Joined by Gomez's fiancé, Benny Blanco, and a host of close pals, the "Cruel Summer" songstress made a stylish entrance at the festive bash.Article continues below advertisementIn a photo dump shared on Instagram, Swift appeared glowing in a chic black long-sleeved dress, accentuated by her signature red lip. Gomez, stunning in a sequined jumpsuit and fur jacket, beamed as she posed amidst a colorful pool of balloons.