Pop-rock trio Haim, actress Jaime King, singer-songwriter Lorde and Swift arrive at the 16th Annual InStyle and Warner Bros. Golden Globes after-party.

The friends and tour mates make time to hang out and keep fit by hiking in Beverly Hills.

The Red Tour opening acts Mahone and Sheeran celebrate their MTV VMA nominations at dinner with Swift, who in turn, celebrates by leaving a $500 tip for an $800 bill!

The twang singers greet one another on the carpet at the 2009 Academy of Country Music Awards.

Swift and the ladies of the pop-rock band Haim sing along to Justin Timberlake's hits at his concert at the Barclays Center. (And yes, that is Jay Z and Beyoncé sitting behind them.)

Longtime friend Stone presents Swift with the Ultimate Choice Award at the 2011 Teen Choice Awards.

Swift and Stone mingle with movie star Paltrow at the 2011 Vanity Fair Oscar Party.

Swift joins Jersey royalty Bon Jovi and actual royalty Prince William in singing "Livin' on a Prayer" at the Winter Whites Gala in support of UK-based charity, Centrepoint.

Swift listens in on a conversation with superstar Bono and model/actress Ross at the 2014 Leonardo DiCaprio-Weinstein Company Golden Globes after-party.

Folktronica singer-songwriter Goulding joins Swift for her final performance on the European leg of The Red Tour in London.

Longtime friends Swift and "Modern Family" star Hyland joke on Instagram that they look like a "strait-laced mom" and "rebellious teen daughter" before heading out to dinner in New York.

Actresses Steinfeld and King cut a rug with Swift at the 2014 Leonardo DiCaprio-Weinstein Company Golden Globe after-party.

Singer-actress-dancer Hough and Swift strike a pose at a benefit in Beverly Hills.

Swift hugs TV personality Osbourne at the 56th annual Grammy Awards Pre-Grammy Gala and Salute to Industry Icons honoring Lucian Grainge.

Swift and Delevingne celebrate during the Victoria's Secret Show in 2013.

Actress-director Dunham and Swift catch up at HBO's Official Golden Globe Awards after-party.

Swift and the Victoria's Secret model don horseback riding attire for a quick winter trip to Whole Foods in Manhattan.

Swift poses with indie pop band fun., including future "1989" collaborator Jack Antonoff, backstage at the 2012 Grammy Nominations Concert.

Swift and singer/actress Agron grab a meal in West Hollywood, Calif.

Swift and model/former roomie Kloss pose with Heidi Klum and a fan at the New York Knicks home opener at Madison Square Garden.

Swift sits courtside with actor couple Seyfried and Long in NYC at a Knicks-Magic game.

Swift duets with the legendary rocker when she joins The Rolling Stones onstage at a 2013 Chicago concert.

Sometime besties Swift and Gomez dish on who knows what (or who!) at the 2013 MTV Video Music Awards.

Swift celebrates another successful Victoria's Secret Fashion Show with the lovely lingerie ladies and fellow performers Ed Sheeran and Ariana Grande.

Singer/actress Lovato and Swift snap a selfie at the 2014 MTV Video Music Awards.