The Bucks have signed second-round pick Doron Lamb, according to the Bucks' PR Twitter feed, which attached of Lamb signing his contract.
Lamb was the 42nd-overall pick in the 2012 draft, and will likely receive the rookie minimum from Milwaukee. According to Charles F. Gardner of the Milwaukee Journal Sentinel (Twitter link), the deal is for three years, though I would guess it's mostly non-guaranteed.