46 year-old Philippa Coppleston-Warren also hijacked an Alexa device belonging to the Lincolnshire businessman, and used it to scare his new girlfriend.
Southwark Crown Court was told that she’d hacked into the device to flash the house lights.
She’d also used the voice facility to tell the woman to leave her boyfriend’s home.
Coppleston-Warren, of Paulton’s Square in Chelsea was granted bail while waiting to be sentenced, on condition she didn’t contact the man or visit his home.