WATCH: Lana Del Rey Debuts New Song with Quavo at Boston Concert

The duo teasing the new tune "Tough" since May

Lana Del Rey, left [Charles Reagan], Quavo, right [Getty/Coachella]

Last night in Boston after weather delays, Lana Del Rey took the stage at Fenway Park for a headlining set. Despite getting on stage late, she managed to crank out a 15-song set, which included the debut of some new music. She started out her performance with a snippet of a new, untitled song. The brief clip included the lyrics, "Past, present, future/Jesus saves and I just worship/A thousand ways."

Fans were floored, but little did they know that a much bigger surprise was in store.

Later in the set, Lana was joined on stage by Quavo. The duo had been teasing a new song together on social media since May. In front of a capacity crowd, they debuted the all-new "Tough" together. Check out fan-filmed footage of the performance below.