Although the two took a trip to Thailand last month, they've somehow managed to avoid being photographed together...until now.
Russell escorted Katy to the Fendi fete in Paris, where the couple is currently visiting for Fashion Week.
The notorious womanizer seemed be acting like a gentleman, escorting Katy through the crowd and shielding her from the paps.
The pair have been twittering about their vacay in the City of Light, naturally...
"I'm in 'Gay Paris' - I swear as an Englishman that by the time I leave tomorrow it'll be known as 'Hetero Paris'. Or at least 'Bi Paris'," Russell posted on his Twitter.
"REAL WORLD: PARIS!" Katy chimed in on hers.
She first met Russell in NYC at the VMAs, where the host made no secret of his crush on the singer, joking about her tight pants onstage and how they were staying at the same hotel.
Looks like he's managed to land his lady!
What do you think of this new duo...and will they last?