The LA Galaxy star will join the Italian giants in January on a short term loan deal.
Ronaldinho said: “He’s a great champion. I hope he’s happy with us.
“We’ll take turns taking free kicks.
“I’ve met him in the past and I have always been struck by his class.”
AC Milan vice-president Adriano Galliani added: “David’s arrival is a dream that becomes a reality.
“We haven’t written the contract but the agreement has been reached.
“Beckham will be at Milan on loan from January 7 until the start of the Major League Soccer, hence, for two months-and-a-half to three months.”