WATCH: Mary J. Blige, Jennifer Lopez Duet at Chime for Change Concert

An unannounced Mary J. Blige joined Jennifer Lopez during her set at Chime for Change’s The Sound of Change concert in London on Saturday (June 1) night. The two performed the timeless Beatles classic “Come Together.”

After digging deep into her roots rock croon, J. Lo, only a recent addition to the Chime for Change lineup, shouted “C’mon! I need a little help Mary.” The two women put their power vocals to the test for one of the concert’s highlights.

Chime for Change is a global initiative aimed to empower women. It is spearheaded by Beyonce, Salma Hayek and Gucci creative director Frida Giannini. Beyonce also performed later in the evening. Watch her like take of “Grown Woman” here.

Full J. Lo set: