The star was looking sleek in figure-hugging sequinned dress with a black and white zig zag pattern at the party for her I Remember Me album.
She kept the look mostly monochrome with towering black heels and silver sparkly bangles alongside a cheeky pop of colour via some fuchsia lipstick.
The outfit has already been referred to as an 'optical illusion dress' with people speculating that the zigzag pattern makes her look slimmer than ever but we think Jennifer looks happy and healthy.
What do you think? Are we too obsessed with celebrity weight?