The pair shared a brief fling earlier this year before their recent reunion.
A source close to the Aussie singer told New Idea that “After spending some time away from Matthew, Delta realised that he was The One."
Now, the brunette has been spotted going about her daily life in LA.
The Born to Try star wore blue flared jeans and gold stilettos as casually pumped gas into her black Porsche.
Peering over her sunglasses, the star rocked her iconic loose waves.
The 33-year-old has kept her lips zipped about her love life this year, after telling InStyle she had decided to keep that part of her life private.
Her relationship with Matthew went public at the start of this year after the pair were caught kissing while on holiday in Hawaii on New Year's Eve.
But keeping her new love private might be just what the starlet needs, after Kyle Sandilands spilled the dirt on his radio show about Delta's 'spitting game' with her ex boyfriend Brian McFadden.
Each to their own!