The pair appeared close as they sat together in a corner of London's Mayfair Club on Friday night, according to the Daily Star Sunday.
A source said: "Aston and Louisa arrived together at 1am. Aston got a table covered in vodka bottles and invited people to join them.
"But while most of their friends danced Aston and Louisa spent the night cosying up in the corner of the club."
The 22-year-old JLS star dated Lytton before rising to fame on The X Factor.