Cara Delevigne Got St. Vincent a David Bowie-Signed Guitar

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Cara Delevingne and Annie Clark attend the De Grisogono party during the 68th annual Cannes Film Festival on May 19, 2015 in Cap d'Antibes, France. 

Amid rumors of a breakup, model/actress Cara Delevingne gave her girlfriend St. Vincent (aka Annie Clark) a fairly extravagant gift -- a Airline Twin Tone guitar signed by none other than David Bowie.

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"Best gift ever in the entire world. (Heart emoji...)," the rocker said in the caption. See Clark's new axe below: