Taylor Swift has an interesting list of ex-boyfriends with some more significant in Hollywood than others. The "Willow" songstress has dated A-list actors, musicians, and even one grandson of a famous political figure who have all made an impact on the songstress's life and her music.

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Taking a look back at all of the men Swift once dated, it's easy to see who ranks as the most famous by looking at their Instagram followers. While the singer might have helped some of the past men in her life gain more followers on social media, most of them are successful in their own right. The 10 men listed below are a mix of prosperous Hollywood stars and a few actors whose careers fell short, which is why they might not have as many followers on Instagram. However, one thing that all have in common is that they all once dated Taylor Swift.

10 Conor Kennedy - 6,900 Followers

In 2012, Taylor Swift began dating the grandson of Robert F. Kennedy, Conor Kennedy, who she met after bonding with his grandmother, Ethel. Soon, the pair were spotted hanging out at the Kennedy's compound in Hyannis Port, and reportedly even purchased their own home in the Massachusetts area.

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However, their summer love didn't last, as Kennedy did not take their relationship seriously as he was only 18-years-old when they dated. The two broke up and Swift wrote the song "Everything Has Changed" about him. Surprisingly, he only has a little over 6,000 followers, even though he dated one of Hollywood's most famous stars.

9 Lucas Till - 416,000 Followers

Lucas Till and Taylor Swift dated briefly back in 2009, with Till stating later on that the two were better off as friends. Fans may recognize Till for his role in the television reboot of MacGyver and his role in Hannah Montana: The Movie, and he was cast as Swift's love interest in her song, "You Belong With Me."

Today, Till continues his role as Angus MacGyver on CBS and has a decent amount of Instagram followers, who still want to know what he's been up to since his split from Swift. The star has a little over 400,000 devoted Instagram followers, which is nothing compared to the rest of the men on this list.

8 John Mayer - 5.1 Million Followers

Taylor Swift and John Mayer were largely talked about when they began dating in 2009 because of their 12-year age gap, but that didn't stop the two stars from starting a serious relationship. While it didn't last long, Swift did write one of her saddest songs about the singer, releasing "Dear John" in 2010.

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John Mayer is a famous singer and musician so it's no wonder why he has amassed 5.1 million Instagram followers. He's also dated numerous other female celebs in Hollywood, including Jennifer Aniston, Katy Perry, and Jessica Simpson.

7 Taylor Lautner - 6.1 Million Followers

Taylor Swift and Taylor Lautner met on the set of the movie Valentine's Day where they portrayed high school sweethearts. The two hit it off and began dating in August of 2009, but their relationship hit a snag and Swift reportedly dumped the actor that December.

Like all of her other exes, Swift's song "Back to December" is about Lautner, where she sings, "Your tanned skin, your sweet smile." Lautner's career hasn't quite blossomed since he starred in the Twilight series, but he still has around 6.1 million Instagram followers who want to know what he's been up to.

6 Jake Gyllenhaal - 6.3 Million Followers

Taylor Swift tried to give dating much older men another try when she and actor Jake Gyllenhaal went official in 2010. The two have a 10-year age gap and they were often seen out and about in New York City and L.A.

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According to InStyle, the age difference ended up playing a big role in the couple's breakup and they parted ways in 2011. There are actually quite a several songs written by Swift that is thought to be about the actor, including, "We Are Never Ever Ever Getting Back Together" and "All Too Well." Gyllenhaal is, of course, one of the most famous actors in Hollywood and has a massive Instagram following of 6.3 million.

5 Tom Hiddleston - 8.4 Million Followers

Tom Hiddleston and Taylor Swift had a short-lived romance that shocked many fans. The pair met in New York and traveled to all parts of the globe, including England, Australia, and Italy. The British actor appeared to be on cloud nine with the songstress, even wearing an "I Heart T.S.'

The couple didn't last long, but it didn't seem to bother fans who appreciate Hiddleston's career as an actor way more than his personal relationships. He has a whopping 8.4 million followers on Instagram.

4 Calvin Harris - 9.8 Million Followers

Taylor Swift's relationship with Scottish DJ Calvin Harris was one of her longer-lasting romances and one that she had no problem was in the public eye. The stars would attend red carpet events together and they would both post photos of one another on their Instagram pages.

The celebs split in 2016 and there didn't seem to be any love lost between the two, especially when Swift retweeted Harris' tweet about a relationship coming to an end. Harris has a big following on Instagram, with 9.8 million followers.

3 Joe Jonas - 12.9 Million Followers

Joe Jonas and Taylor Swift dated from July 2008 until October 2008 and it was her first major public breakup, and according to InStyle, one of Swift's most harshest breakups because it was reported Jonas broke up with her via a 27-second phone call.

Swift's two songs, entitled, "Last Kiss" and "Forever and Always" are supposedly written about Jonas. The Jonas Brother member has since moved on from the split, marrying Game of Thrones actress Sophie Turner and welcoming a daughter. He has an Instagram following of 12.9 million.

2 Harry Styles - 34.9 Million Followers

Taylor Swift and Harry Styles had a short-lived romance in 2012, but it seemed to be one of her most personal after she released the song "I Knew You Were Trouble" about the former One Direction star. The songstresses album 1989 was reportedly also filled with references about Styles, and her song, "Style" was pretty much self-explanatory.

Styles currently has 34.9 million Instagram followers, making him one of the most popular exes of the singer's.

1 Zac Efron - 44.7 Million Followers

Zac Efron and Taylor Swift have a rumored romance that started when the pair were promoting their movie The Lorax. The two stars denied their relationship, even creating a parody of Foster the People's "Pumped Up Kids" that cleared the air about their "fake" romance. However, many people would have loved to see the two together even Efron's 44.7 million Instagram followers.

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