A stunned Celtics management is attempting to grasp something it honestly never envisioned: Ray Allen has decided to trade in his Celtics jersey for South Beach. Not since Johnny Damon became a Yankee has Boston's fandom been forced to absorb such a shocking change of uniforms.

And the impending Hall of Famer even gets to keep his number. Heat owner Micky Arison last night posted a foreboding tweet that spelled out the result of Allen's two-day visit to Miami to meet with team president Pat Riley and coach Erik Spoelstra.

Witness the following post: "It's 2:30 a.m. in London and I was just woken up with great news: Welcome to the family, #20!!"

Jim Tanner, Allen's agent, confirmed the message behind Arison's tweet minutes later.

A Celtics source expressed surprise, noting that talks with Allen had been going on for "a long time." The Celtics were prepared to offer Allen a two-year, $12 million contract that would have paid him twice the money offered by Miami over the same period.

Allen, tired of being offered as trade bait by Danny Ainge in each of the last two years, was also being offered trade security by the Celtics, either in the form of a trade kicker or a no-trade clause.