They've been looking blissfully happy in recent weeks as their romance has blossomed.
Having already treated the Spanish model to a romantic break at a spa last weekend, the singer joined her on Tuesday night for her birthday party.
And as with previous occasions when the pair have been seen together, he couldn't wipe the grin off his face - or, it seems, let go of his girlfriend's hand.
Elen, looking gorgeous in a pretty red dress with a ruffled skirt, and a cropped black jacket, looked similarly happy as they emerged from the party around 3am.
Peter, meanwhile, was quick to tell the waiting photographers just how happy he was in his new relationship.
