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They have refused to confirm their relationship - despite being seen kissing on dog walks in London.
But Laurence Fox, 39, and Lilah Parsons, 30, decided to make things red carpet official on Monday night, as they attended the Passavant and Lee fashion presentation together.
Couple - London - Fashion - Week - Statement
The couple chose London Fashion Week to make their biggest statement yet about their new-found romance, after months of speculation.
Lilah, who recently celebrated her 30th birthday, arrived with the thespian at the St Martin's Lane store, finally putting the rumours to bed.
Lilah - Cardigan - Blouse - Jeans - Laurence
Lilah sported a comfortable ensemble comprising a fluffy cardigan and spotted blouse with black jeans, while Laurence's ensemble was typically eccentric.
Keeping close for photographs, the couple looked at ease in one another's company.
Item - Summer - Actor - Relationship - Vogue
It's believed they have been an item since at least last summer, following the actor's failed relationship with Vogue Williams.
Elsewhere, Vogue this month announced her engagement to Made In Chelsea hunk Spencer Matthews.
Romance - Laurence - Lilah - Couple - Hands
A budding romance between Laurence and Lilah came to light in late 2017, when the couple were spotted holding hands and kissing on...
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