Wearing black buckled riding boots and a furry black coat, a bundled up Kate could be seen exiting her building separately from Matt in an attempt to evade the paparazzi.
The pair are headed back to LA after celebrating Scottish actor Gerard Butler‘s star-studded 41st birthday over the weekend.
After meeting at California’s Coachella festival in April, Kate and Matt have been inseparable ever since, with Matt spending more time in New York and Los Angeles than England.
And recent reports suggest that things are getting so serious between the pair that they are planning a big family Christmas with Matt flying his parents Marilyn and George out from Exeter to California.
A source tells The Sun: “It will be the first meeting of both sets of parents. Things are getting serious between Kate and Matt and it’s the obvious next step. Christmas is the only time they can get everyone together and the festive season is also the best time to do it.”