Lauren Jauregui surprised and delighted US viewers when she jumped on stage during Halsey's Good Morning America Summer Concert Series yesterday (June 1).

The songstresses performed "Strangers" together, the Halsey single featuring Jauregui, which was released last year on May 26. It was the second single to be released from Halsey's latest studio album, "Hopeless Fountain Kingdom".

After the show, Jauregui tweeted: "Thank you for having me mama ❤️always end up smiling like a child when we get to perform together 😂LOVE YOU! @halsey”

The two had originally performed the song together last summer on The Today Show's Citi Summer Concert Series in June. That performance was followed by another at iHeartSummer '17 Weekend in Miami Beach, Florida.