Gaga, real name Stefani Germanotta, is said to have ditched her usual outrageous clobber when she spent Christmas in Omaha, Nebraska, with her man Luc Carl and his parents.
The 24-year-old Bad Romance singer was out to impress as it was allegedly the first time she has visited Luc's childhood home.
A source told British newspaper The Sun: 'Gaga is used to the best hotel suites in the world but wanted to sleep with Luc in his old bed in the room he grew up in.
'The holidays are a special family time so she wanted to slot in without any fuss. It's a chance for her to get to know them, show her domestic side and prove there's more to her than what they see on the TV.'
The usually outrageously dressed star's only extravagance was reportedly taking the family to a local bowling alley and casino.