Another concert, another surprise! Shirtless Jason Derulo joins Taylor Swift on stage for a special performance in Washington on The 1989 Tour

Taylor Swift has been pulling out all the stops in making sure her 1989 World Tour is one to remember.

After inviting a string of A-list stars to join her on stage over the past few shows, Jason Derulo is latest recruit to help the songstress out.

The 25-year-old musician joined Taylor for a special performance during her stop in Washington, which was held at Nationals Park on Tuesday evening.

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Another concert, another surprise! Jason Derulo joined Taylor Swift for a special performance during her 1989 tour stop in Washington, which was held at Nationals Park on Tuesday evening

Another concert, another surprise! Jason Derulo joined Taylor Swift for a special performance during her 1989 tour stop in Washington, which was held at Nationals Park on Tuesday evening

Dressed in a sparkly white bralet and high-waisted pants, the blonde stunner, also 25, proudly showed off her toned figure to perfection while showcasing her vocals at the same time.

She rounded off the sexy proceedings with an eye-catching pair of thigh-high heeled boots while wearing her golden-tinted locks in tousled waves.

Meanwhile, Jason ripped off his black and white shirt and bared his impressive physique for fans to see.

Doing their thing: The two stars entertained the buzzing crowd with a special rendition of Jason’s hit song Want to Want Me as well as his new track Cheyenne

Doing their thing: The two stars entertained the buzzing crowd with a special rendition of Jason’s hit song Want to Want Me as well as his new track Cheyenne

Daring to bare: Dressed in a sparkly white bralet and high-waisted pants, the blonde stunner proudly showed off her toned figure to perfection, while Jason ripped off his shirt and bared his impressive physique for fans to see

Daring to bare: Dressed in a sparkly white bralet and high-waisted pants, the blonde stunner proudly showed off her toned figure to perfection, while Jason ripped off his shirt and bared his impressive physique for fans to see

The two stars entertained the buzzing crowd with a special rendition of Jason’s hit song Want to Want Me as well as his new track Cheyenne.

Following the concert, Taylor excitedly tweeted: ‘I got to sing my fav summer JAM 'Want To Want Me' with @jasonderulo in DC-I'm also loving his new single 'Cheyenne'!’

Jason joins the likes of Lorde, HAIM, The Weeknd who have joined the Shake It Off hitemaker on her hugely popular 1989 tour.

Updating fans: Following the concert, Taylor excitedly tweeted, ‘I got to sing my fav summer JAM 'Want To Want Me' with @jasonderulo in DC-I'm also loving his new single 'Cheyenne'!’

Updating fans: Following the concert, Taylor excitedly tweeted, ‘I got to sing my fav summer JAM 'Want To Want Me' with @jasonderulo in DC-I'm also loving his new single 'Cheyenne'!’

At her show in East Rutherford, New Jersey she was joined on stage by Lena Dunham, Gigi Hadid, Hailee Steinfeld and Lily Aldridge as well as US women's football team.

Players like Alex Morgan, Megan Klingenberg, Tobin Heath, Kelly O'Hara, Heather O'Reilly and Lauren Holiday came out with their jerseys on as some of them even waved American flags.

Last month, Taylor treated her London's British Summertime Festival goers with a special appearance from gal pals Gigi, Kendall Jenner, Karlie Kloss, Cara Delevingne, Martha Hunt and Serena Williams.

Her 1989 tour kicked off in May and is scheduled to run through to December, while she promotes her album of the same name - which has sold over 7million copies worldwide.

Star pals: Jason joins the likes of Lorde (pictured), HAIM, The Weeknd who have joined the Shake It Off hitemaker on her hugely popular 1989 tour

Star pals: Jason joins the likes of Lorde (pictured), HAIM, The Weeknd who have joined the Shake It Off hitemaker on her hugely popular 1989 tour

She's a sport! Like a trooper, Taylor  honoured the U.S. women's soccer team by bringing them onstage after their World Cup championship on Friday night in New Jersey

She's a sport! Like a trooper, Taylor honoured the U.S. women's soccer team by bringing them onstage after their World Cup championship on Friday night in New Jersey

Calling in favours: She also surprised fans by calling on her famous pack of girlfriends - Lena Dunham, Hailee Steinfeld, Gigi Hadid and Lily Aldridge – to help recreate her popular Bad Blood video onstage

Calling in favours: She also surprised fans by calling on her famous pack of girlfriends - Lena Dunham, Hailee Steinfeld, Gigi Hadid and Lily Aldridge – to help recreate her popular Bad Blood video onstage

Making headlines: Last month, Taylor treated her London's British Summertime Festival goers with a special appearance from gal pals Gigi, Kendall Jenner, Karlie Kloss, Cara Delevingne, Martha Hunt and Serena Williams

Making headlines: Last month, Taylor treated her London's British Summertime Festival goers with a special appearance from gal pals Gigi, Kendall Jenner, Karlie Kloss, Cara Delevingne, Martha Hunt and Serena Williams

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