Mary Lambert will join Macklemore and Ryan & Lewis as they perform gay marriage anthem Same Love at the MTV Video Music Awards on Sunday night.

In Same Love – available on The Heist – Lambert sings the chorus: “And I can't change; even if I tried; even if I wanted to; my love she keeps me warm.”

Earlier this month, Lambert released She Keeps Me Warm, a full track that builds on that chorus.

In releasing the single, Lambert described it as “the other side of the Same Love story.”

This week, she released the video for She Keeps Me Warm. (The video is embedded on this page. Visit our video library for more videos.)

“I felt like there was another story to Same Love,” Lambert told Billboard. “I was worried about feeling tacky, like I'm some one-trick pony, but at the same time, there's a reason that the chorus resonated with people. I think that the chorus itself is non-political – it's about this universal idea of what love is. So I made a song surrounding that idea.”

She added in comments to BuzzFeed: “I just wanted to provide a visibility for a lesbian relationship.”