Katy Perry and Russell Brand haven't spoken since 2011

This is one relationship that clearly didn't end well.

Vin Diesel's Touching Karaoke Tribute To Paul Walker

The 'Furious 7' star posted a heart-wrenching musical tribute to his late friend Paul Walker on his Facebook page. Diesel captioned the tribute, "The ever continuing process of healing...all love" which featured his gravelly vocals, accompanied by a nostalgic montage of photos and videos of his late co-star and best friend.