Gwen Stefani and Adam Levine performed Maroon 5's 'My Heart Is Open' at the 2015 Grammy Awards and they totally proved that, as much as we love them individually, they're a total musical power couple. The idea that they may never have collaborated without 'The Voice' bringing them together is a scenario we don't even want to begin to imagine.

Gwen was totally Old-Hollywood-glamorous in a long, red dress with her blonde hair pinned up, and Adam looked totally sharp in his black suit with his hair slicked back. They brought an emotional, heart-felt quality to 'My Heart Is Open' that was highlighted -- literally -- by the lights stationed behind them that illuminated their performance. Their individual vocals -- both totally unique and immediately recognizable -- blended together so perfectly, making for a fantastic performance.

If you missed it, be sure to check out Gwen and Adam performing 'My Heart Is Open' in the video above!

See Photos From the 2015 Grammy Awards!