Watch: Taylor Swift Celebrates Brittany Mahomes' 30th Birthday in Nashville After EngagementTaylor Swift is celebrating another year of friendship with Brittany Mahomes. Days after she announced her engagement to Travis Kelce, the pop superstar was seen celebrating Brittany's 30th birthday while sitting outside at a restaurant in Nashville. For the occasion, as seen in photos captured by fans and shared on social media, the "Karma" singer donned a plunging black top with thin spaghetti straps.