The couple has been dating for the last few months, and the British catwalk star went public with the romance in June (15), telling Vogue magazine, "I think that being in love with my girlfriend is a big part of why I'm feeling so happy with who I am these days."
On Sunday (20Jul15), a U.S. report suggested they recently parted ways, but St. Vincent appears to have now refuted the rumours by sending Delevingne a public declaration of love via her Instagram.com page.
In the post, the singer, real name Annie Clark, shared a picture of a guitar signed by rock legend David Bowie and thanked her partner for the special gift, writing, "An Airline Twin Tone guitar signed by David Bowie. Thank you, Cara Delevingne. Best gift ever in the entire world."
She also added the image of a heart to her post.