A source told Us Weekly: "It was very nonchalant, while he was referring to married and single couples, he just dropped the line, 'I'm single.'"
The Oscar-winner is also believed to have attended Beyonce and Jay-Z's post-Oscars bash at Chateau Marmont with former Gossip Girl star Jessica Szohr, 33, on Sunday night.
They also made an appearance at the Vanity Fair Oscar Party, but Jessica reportedly spent most of the evening with her model pal Alexis Rupp.
Katie, who has a 12-year-old daughter called Suri with ex-husband Tom Cruise, and the Django Unchained star were first romantically linked to each other for the first time back in 2013.
However, the pair subsequently spent years insisting that they were merely just good friends.
Despite, the high profile duo finally went public with their relationship in September 2017, when they were pictured holding hands while walking along a beach.
A source previously revealed Jamie and Katie live "very independent lives".
They shared: "They've always lived very independent lives, but try to make time to see each other. It's not uncommon for them to go long stretches without seeing each other. And they're still very, very private.
Adding: "You're not going to hear or see every time they're together because they don't flaunt their relationship in public."
The relationship news comes months after the couple were reported to be getting married in Paris. // <\/s'+'cript>'); // --> //]]> From ICE
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