Kristen Stewart and St Vincent have been "inseparable" ever since they started dating over two months ago. Now, the American Ultra star and the Digital Witness singer have made their relationship official as they made their debut as a couple at CFDA/Vogue Fashion Fund Show and Tea event at the Chateau Marmont in West Hollywood, Los Angeles on Wednesday (26 October).

The 26-year-old actress was dressed in a menswear-inspired ensemble: black blazer paired with hounds-tooth trousers, while the musician (real name Annie Clark) sported a cropped tweed jacket and dark trousers.

The couple were seated next to each other at the bash, which was also attended by celebrities like Emma Stone, Katy Perry, Ciara, Rosie Huntington-Whiteley and Alessandra Ambrosio among others.

Reports about Kristen and St Vincent dating each other surfaced when they were first spotted together in late August. Since then the two have been spotted at a number of outings.

"Kristen [Stewart] and Annie [Clark] have been inseparable since they started dating," a source previously told HollywoodLife.

"Now that they are back in LA, Kristen has been introducing Annie to all of her friends, including her mom and dad. She introduces Annie as her girlfriend, and she's definitely not shy about being affectionate with her around her family."

"They spent almost every day together after that [New York Film Festival]," a source previously told Us Weekly. "It's been very romantic. Kristen is always whispering closely in her ear and asking her opinion."

Before dating St Vincent, Stewart was in an on-off relationship with her former assistant Alicia Cargile, after ending her romance with French singer SoKo. St Vincent singer recently split from model/actress Cara Delevingne after dating for a little over a year.