Their co-headlining trek hit Madison Square Garden in New York City.

Charli XCX and Troye Sivan bring out Lorde and Addison Rae at Madison Square Garden in New York City. The surprise guests ...

Charli xcx brought out all the "good ones" at the New York City Sweat Tour. On Sept. 24, the pop star, 32, had a few ...

The “360” singer hosted a star-studded Sweat Tour afterparty Monday night, following her and Troye Sivan’s sold-out show at Madison Square Garden in New York City.

On Monday evening, the duo took to Madison Square Garden and were joined on stage by Lorde, who performed "Girl, so Confusing ...

During Charli XCX's stop at Madison Square Garden with Troye Sivan for their Sweat tour, the "Von Dutch" singer was joined by Lorde and Addison Rae.

Lorde thrilled fans when she made an unexpected appearance at Charli XCX's Sweat tour stop at Madison Square Garden in New York City on Monday night. The two artists teamed up for a live performance ...

Charli XCX and Troye Sivan created a brat moment in their star-studded party on Monday night.After their Sweat Tour show at ...

With September 22 in the rear view, BRAT Summer is officially, technically over. However, Charli XCX isn't going anywhere.

Charli XCX brought out Lorde for the ‘Girl, So Confusing’ remix during her Monday, September 23, show at Madison Square ...

With September 22 in the rear view, BRAT Summer is officially, technically over. However, Charli XCX isn't going anywhere. She's got a BRAT remix album on the way, and her Sweat Tour with Troye Sivan ...