Despite the fact that she is currently on her world tour, Taylor Swift has proven that she can go the distance when it comes to supporting her rumored boyfriend, Calvin Harris.

Swift was spotted at 102.7 KIIS-FM's Wango Tango 2015 concert, where she cheered on the "Summer" hitmaker as he took the stage.

The 25-year old wore brown shorts and a loose printed top with her hair down and minimal makeup. Clutching a Diet Coke in her hand, she was seen dancing and singing along as Harris performed, and the "Blank Space" singer was accompanied by one of her good friends Alana Haim.

Swift and the 31-year old Scottish singer and DJ were later spotted sharing a kiss and holding hands backstage after he finished his set, a source told E! News, adding that the pair left the StubHub Center in Los Angeles together.

Though the couple has yet to publicly confirm their relationship, the source said, "They are cute together. They seem happy. They definitely look like they are dating."

The two have sparked rumors back in March when they were spotted grocery shopping at Whole Foods together and getting cozy at a Kenny Chesney concert. Since then, Swift and Harris have been seen together on several occasions, including last week in Las Vegas.

Meanwhile, an insider claims that Swift wants to spend most of her free time with Harris, as she is currently on a break from her world tour. The singer kicked off her "1989" world tour at the Tokyo Dome on May 5 and will perform her next show in Las Vegas on May 15.

"Taylor doesn't want to miss a minute with Calvin, she loves being with him," a source told Hollywoodlife. "That's why she went along to watch him perform at Wango Tango. She knows she's going to be busy on her world tour, and will miss him hugely when they're apart."