Jonas, 25, also posted a pic captioned, \"#IMONABOAT.\"
Swift was in London over the weekend for the British Summertime festival.
She posted a pic from the show with thousands upon thousands of excited fans in attendance.
\"The crowd of 65,000 that went on forever, as far as I could see in each direction... Hyde Park,\" she wrote.
Three weeks ago, Swift made her social debut with Harris, posting a picture of the couple hanging together by the pool.
Swan goals.
A photo posted by Taylor Swift (@taylorswift) on Jun 10, 2015 at 3:25pm PDT
Then Harris, 31, himself tweeted a week ago, \"I just played a gig inside a giant owl and my girl just changed the entire music industry what a day.\"
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