Well, whaddya know?
"Just ran into my homegirl @jlo so happy to see u!!" Keys tweeted along with a photo of the gals happily posing for the camera.
So, what are these two lovely ladies doing across the pond?
Keys is headlining at the O2 both tonight and on Friday while Lopez is keeping busy promoting her latest single "Live It Up."
J.Lo will also be participating this Saturday in the "Sound of Change Live" concert in support of Chime for Change, a campaign benefiting education, health and justice for girls.