Fans at Citi Field presumably have noticed by now the six colorful M&M’S characters on the wall in leftfield in the area formerly known as the Party City Deck.

But the sponsorship will become official on Tuesday, when the Mets announce a partnership with the candy brand along with a new name for the 102-seat area: the “M&M’S Sweet Seats.”

The partnership also will include M&M’S characters walking the concourse for photo opportunities and other tie-ins.

Wes Engram, the Mets’ vice president for corporate partnerships, said the M&M’S deal was a couple of years in the making, and coincides with the brand’s 75th anniversary.

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It is the latest example of the Mets’ increased attractiveness to sponsors after last year’s run to the World Series.

“We made a concentrated effort to really this offseason go after marquee brands, and M&M/Mars certainly fits that profile,” Engram said.