Kelsey Grammer plans to celebrate his wedding to girlfriend Kayte Walsh at The Plaza Hotel on Feb. 25 — and the invites have been sent even though he’s not yet divorced from Camille Donatacci.

Grammer and Walsh have booked The Plaza’s iconic ballroom at a cost of $100,000- plus for their lavish reception. But the “Frasier” and “Cheers” star is still hammering out the details of a divorce settlement with Camille, 42, whom he dumped last summer after 13 years of marriage for British former flight attendant Kayte.

A source joked that the wedding could end up being postponed if he and Camille don’t settle in time, “making the invitation, which has already gone out, a collector’s item.”

Another source told us, “Kelsey and Kayte have booked the Plaza ballroom for the reception. Despite the lavish surroundings, they want an intimate wedding with less than 150 guests. Kayte has laid out all the details, all the timings. The room will be decorated all in white, including a white cake. There will be a very tight guest list, and they won’t allow cameras in. They’re flying a lot of Kayte’s family members in from England and putting them all up at The Plaza.”

Kelsey knows the wedding routine well by now — this will be his fourth. The only thing that could ruin the big day would be if he and Camille are still at war over their settlement, with sources telling us she’s already turned down a $40 million offer and wants $50 million. They also have homes here and in Los Angeles, Hawaii, Colorado and the Hamptons. But a source close to Kelsey said, “He’s confident they will settle in time.”

Camille said on “The View” yesterday, “He did rush it [the wedding]. It’s a bit impetuous, don’t you think? He wants what he wants right away . . . It’s almost like a child.”

A rep for Grammer last night confirmed his wedding reception will be held at The Plaza following a ceremony elsewhere.