The Birmingham born beauty is known for her famously curvaceous figure, but fans nearly saw a little too much of it as she made her way across London for a fun night of parties.
Demi, who shot to fame when she dated Kylie Jenner's ex Tyga, left almost nothing to the imagination in the revealing outfit as she arrived at Bob Bob Ricard in Soho, for her second party of the evening.
The curvaceous star struggled to contain her chest in the low cut halterneck dress.
She also threatened to display too much with her dramatic thigh-high split skirt on Monday night, as she headed to the House of CB Christmas Dinner in a perilously plunging ensemble.
The racy outfit certainly fitted the model to a tee with its wide opening across the front flattering her chest.
The flimsy halterneck straps struggled to hold her in place and almost left all of her famous cleavage on show.
She revealed her tiny waist thanks to the skirt that nipped her in at the middle to flatter her perfect hourglass figure.
The outfit did wonders for her gym-honed legs which could be seen through the racy split in her skirt.
Demi was joined at the bash by fashion loving celebrity fans of the brand - including Lauren Pope and Alesha Dixon.