Are Calvin Harris and Nicole Scherzinger hooking up?

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Calvin Harris and Nicole Scherzinger Dating?

Is Calvin Harris rebounding from Taylor Swift with fellow pop star Nicole Scherzinger?

Despite the rumors, sources told E! News that the pair are strictly friends. Harris and Scherzinger were photographed arm-in-arm leaving a London nightclub over the weekend, prompting speculation that they're romantically involved.

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The photos, which you can see in the video above, were released amid worldwide hysteria over Harris' ex, Taylor Swift, who has quickly moved on from their relationship with actor Tom Hiddleston. The couple has been photographed on three different continents in less than a month.

As for Harris and Scherzinger, the source described them as "casual friends."

See photos of Calvin Harris and Taylor Swift together:

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Taylor Swift Calvin Harris
Friendly relations between Scotland and America. @calvinharris
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Little known fact: Karlie is secretly an unofficial historian/London tour guide. Kind of.
NEW YORK, NY - MAY 28: Taylor Swift,Calvin Harris are seen in Tribeca on May 28, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
Photo by: KGC-146/STAR MAX/IPx 5/26/15 Taylor Swift and Calvin Harris are seen in New York City. (NYC)
Photo by: KGC-146/STAR MAX/IPx 5/26/15 Taylor Swift and Calvin Harris are seen in New York City. (NYC)
LAS VEGAS, NV - MAY 17: Recording artists Taylor Swift (L) and Calvin Harris attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Kevin Mazur/BMA2015/WireImage)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
LAS VEGAS, NV - MAY 17: Recording artist Taylor Swift embraces DJ/producer Calvin Harris after she won the Top Billboard 200 Album award during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
Taylor Swift, right, hugs Calvin Harris after winning the award for top billboard 200 album for “1989” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
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"If they see each other at a club or a party, they will chill," the source continued. "They are not hooking up or hanging out."

Additionally, the rumors are further negated by the fact that the pop singer is allegedly still completely off the market -- she's still tied to tennis star Grigor Dimitrov. Dimitrov previously dated Maria Sharapova.

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