The Les Miserables beauty called off her romance with Welsh presenter Matt Johnson earlier this year (13) and quickly moved on with hunky model David Gandy.
Johnson has since revealed he was "devastated" by the rejection, but he's now dating Roberts, who has been living and working in the U.K. since starring in reality show I'm A Celebrity... Get Me Out of Here! last year (12).
The pair was spotted enjoying an intimate night out together at London hotspot Mahiki on Wednesday (02Oct13).
A source tells Britain's Daily Mirror, "They were being really flirty and playful all night. It was obvious by their relaxed body language that they're really comfortable with each other.
"They were dancing together one-on-one, before stealing a kiss."