The Telephone singer began dating the barman for a second time last year, having previously had a relationship with him before she found fame.
Lady Gaga is apparently planning to marry her boyfriend (PA) Lady Gaga is apparently planning to marry her boyfriend (PA)
And in news that is sure to interest the world's most imaginative wedding dress designers, Lady Gaga is reportedly now engaged.
According to the Daily Star Sunday, the pair spent Christmas together at the home of Luc's parents in Nebraska.
That apparently went so well they have not only chosen to live together in her Bel Air mansion, but also decided to get married.
More: Lady Gaga debuts arty Born This Way short film
An official engagement announcement could be made during the build-up to the release of her new single, Born This Way, but the ceremony itself may be some way off.
A source said: 'She and Luc are in no rush to name a wedding date. She doesn't even have a proper ring because he couldn't afford one.'
Should Lady Gaga and Luc ever get round to actually getting married, the event is sure to be celebrated in Charleston.
The singer is so popular in the area that the city staged its second annual Gaga Day on Saturday, with hundreds of fans turning up in their versions of her bizarre costumes.
One person even attempted a copy of the controversial meat dress for the event, which raised money for the Trevor Project, an organisation that runs a helpline designed to prevent suicides in the gay community.