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Taylor Swift, Calvin Harris

SPW / Splash News

Can you believe it's been one year since Taylor Swift  and her hot man first locked eyes?

The 26-year-old pop star met boyfriend and Scottish EDM artist Calvin Harris, 32, in late February of last year and they soon started dating. This marks Swift's longest known relationship—she had previously dated celebs such as Harry Styles, John Mayer, Joe Jonas, Taylor Lautner and Jake Gyllenhaal, each for several months.

Fellow pop singer Ellie Goulding introduced her to Harris.

"Calvin is a really great mate and he's so fantastic, and Taylor is such a cool person who I love. I thought, 'They're both really awesome and both really tall, they'll be brilliant together,'" she told The Sun last June. 

Check out a timeline of Swift and Harris' relationship.

Feb. 24, 2015: Swift lays her eyes on Harris at the ELLE Style Awards. A fan recently posted on Instagram a photo showing her and Goulding approaching him as he chats with crooner Sam Smith.

Feb. 25, 2015: A day later, Swift and Harris meet at the Brit Awards A source told E! News that that was "when they really connected" and that Harris "was taken with her." The two also hung out at an after-party, along with Mick Jagger, 72, and continued to meet up after that day

Taylor Swift, Calvin Harris,Sir Mick Jagger

David M. Benett/Getty Images for Soho House & Bacardi

March 2015: According to reports, Harris and model Aarika Wolf broke up around the time of the Brit Awards after dating for about seven months.

March 6, 2015: Swift and Harris officially begin dating, as revealed by both one year later with sweet anniversary posts.

March 11, 2015: Harris declares in a radio interview Swift "looks lovely" but is "the opposite of my type" and would swipe left on her on Tinder. He said he likes brunettes.

March 25, 2015: Swift and Harris spark romance rumors when they are spotted at a Whole Foods in Nashville, wearing matching outfits.

March 26, 2015—PDA alert! Swift and Harris attend a Kenny Chesney concert in Nashville and reportedly get "snuggly" during the show.

April 2, 2015—major PDA: Swift and Harris attend a Haim concert at The Troubador in West Hollywood. At one point, she sits in his lap. After the concert ends, they leave together, holding hands, and drive off in the same car.

April 15, 2015: One of Swift's besties, actress Jaimie King, calls Harris "a wonderful man."

April 20, 2015: Swift and Harris are seen inside a car, leaving her home.

April 28, 2015—meow! Harris posts on Instagram a photo of Swift's other two loves of her life—her cats, Olivia Benson and Meredith Grey.

May 9, 2015—more major PDA: Swift cheers on Harris as her performs at the 2015 Wango Tango concert and the two are later spotted sharing a kiss and holding hands backstage.

May 12, 2015: Swift and Harris stepping out together in Venice, Calif., holding hands

May 17, 2015—onscreen love: Swift and Harris attend the 2015 Billboard Music Awards. Swift wins Top Billboard 200 Album and en route to the stage, she stops to embrace her beau, who kisses her on the cheek in front of everyone in the audience...including Styles and his ex Rita Ora.

May 26, 2015: Swift and Harris have dinner in New York City. He pays the bill. The two leave holding hands.

May 28, 2015: Swift and Harris get cozy while having lunch in the city. A source tells E! News, "They are trying to be as private as they can but they are also not afraid or hiding their affection towards each other when they are together in public. They both love New York City and this trip together is really easy and comfortable for them. They both love to eat out and also stay in and just chill."

June 9, 2015—social media love: Swift posts her first Instagram pic with Harris and BFF Gigi Hadid joins in on the fun.

June 10, 2015: Swift share a pic showing her and Harris getting cozy on an inflatable swan in a swimming pool, saying, "Swan goals."

Taylor Swift, Calvin Harris, Instagram

Instagram

June 11, 2015: A source tells E! News Swift and Harris  "are spending every free day they have together" before the singer continues on her sold-out 1989 world tour.

June 14, 2015—friendly exes: Swift and Harris hang out with another celeb coupleGigi Hadid and the singer's ex Jonas, as well as Jessica Alba at Soho House in Hollywood.

June 23, 2015—concert shout-out: Swift performs in Glasgow in Harris' native Scotland and tells the crowd, "I happen to love Scottish people."

June 28, 2015—another group date: Swift and Harris get cozy as they join Jonas, Hadid and another BFF, Karlie Kloss, on a boat ride to a concert.

Joe Jonas, Gigi Hadid, Karlie Kloss, Taylor Swift, Calvin Harris, Instagram

Instagram

June 29, 2015: Swift performs in Dublin and sweetly gestures to Harris while singing her tune "I Know Places" as he watches her from near the sound desk.

July 2, 2015—officially "Instagram official": Harris posts his first Instagram photo of Swift.

July 3, 2015: Swift and Harris spend the Fourth of July holiday together. The singer gets a piggyback ride from her beau.

July 17, 2015: Harris says in a radio interview things are "going absolutely fantastic" with him and Swift.

Aug. 11, 2015: Swift and Harris have dinner at the Italian restaurant Giorgio Baldi in Los Angeles. They "were laughing and being so cute together," an eyewitness tells E! News, adding that Harris was a true gentleman—he pulled out his girlfriend's chair for her and he paid the dinner bill.

Aug. 24, 2015—three magic words: Swift says "I love you" to Harris as he watches her perform a concert in Los Angeles.

Oct. 27, 2015: Harris attends Swift's concert in Miami.

Nov. 4, 2015: Swift's BFF Martha Hunt tells E! News Harris is "fabulous," adding, "I've been on a lot of group dates, that's for sure!"

Nov. 16, 2015: Harris snaps a photo of Swift's cat Olivia chewing on her MTV Video Music Award and the singer posts it on her Instagram page.

Nov. 17, 2015: Swift and Harris have dinner in Hollywood. Another celeb couple, Rosie Huntington-Whiteley and Jason Statham are seen exiting the restaurant soon after they do.

Dec. 13, 2015: Swift cozies up to Harris at her Christmas-themed 26th birthday party.

Dec. 23, 2015: The day before Christmas Eve, Swift shares a cute pic showing her and Harris building a snowman.

Dec. 31, 2015: On New Year's Eve, Swift watches Harris perform at a Las Vegas nightclub party and also parties with actress Ruby Rose.

Jan. 4, 2016—engagement soon? A source tells E! News Swift and Harris "are definitely talking about their future together and the possibility of one day getting engaged."

Jan. 12, 2016—dinner crasher: Swift and Harris have dinner in Los Angeles and are joined at their table by a young fan.

Feb. 15, 2016: Harris does not attend the 2016 Grammys, during which Swift wins three awards, because he is busy in the studio. After the ceremony, they meet up at Hyde nightclub and pack on some PDA.

Feb. 16, 2016: Harris posts on Twitter a pic of Swift accepting her Grammys for Album of the Year, tweeting, "Congratulations to my beautiful girlfriend."

March 6, 2016: Swift and Harris celebrate their one-year anniversary. She shares on Instagram a photo of a gift her beau gave her—a gold locket engraved with the date of the start of their relationship. Meanwhile, he posts on Snapchat a sweet video showing them celebrating with cake.