Kristen Stewart and her musician girlfriend St. Vincent (real name Annie Clarke) are revving the engine on their power couple status, confirming that they have teamed up for a film due to be released next year.

Entitled Come Swim, the short film will be Stewart's directorial debut and has been selected to premiere at next year's Sundance Film Festival in January.

Kristen Stewart collabs with girlfriend St Vincent on directorial debut

Following the announcement, Clark revealed on Twitter that she composed its score. She and Stewart made their public debut as a couple on the red carpet at the CFDA/Vogue Fashion Fund Show at the Chateau Marmont in Los Angeles at the end of October.

The film, also written by Stewart, is described by Sundance as being "a diptych of one man's day, half impressionist and half realist portraits.' Hmm. Mysterious. Would we expect anything less from the notoriously publicity-shy Stewart?

Kristen Stewart collabs with girlfriend St Vincent on directorial debut