Ed Sheeran -- Album of the Year Leads to Night of His Life (PHOTOS)

Ed Sheeran celebrated his Album of the Year win at the BRIT Awards by drinking ALL OF THE ALCOHOL IN LONDON ... or so it seems based on these crazy pics of his night.

Sheeran was spotted all over town Wednesday night -- first hitting up an after-party at Freemasons' Hall and then venturing to The Box Nightclub with Sam Smith.

They reportedly stayed out until 6 AM -- which is obvious from the look on Ed's face at the end of this gallery.

After winning his first award of the night, Sheeran told the show's hosts, "I've got to perform and then I'll drink. Don't film me later."