The Bad Romance singer and her beau are said to have had an intimate moonlight ceremony that a source described as, 'first step towards marriage.'
'They both dressed up and said beautiful handwritten vows. They then exchanged rings in a spiritual service and drank shots before sitting down to a lovely private dinner at a tiny restaurant,' the source revealed to Grazia.
'They wanted to show that they are committed to each other and want to spend the rest of their lives together. They are still planning to marry, but that will come later when she has the time to plan a big Italian-style wedding.'
The death of the 24-year-old star's grandfather recently is said to have prompted her to realise the depth of her feelings for Carl.
'Since her beloved grandfather died last month, Luc has been her rock and she's also had a reminder of just how short life is. She says he's 'The One' and she doesn't want to lose him ever again,' the source said.