Celebrate Grimace’s birthday with a purple McDonald’s milkshake!

INDIANAPOLIS (WISH) — McDonaldland character Grimace is celebrating a birthday and McDonald’s wants fast food fans to join in on the fun.

Starting Monday, fans can stop by McDonald’s for a Grimace Birthday Meal, featuring a special purple milkshake inspired by Grimace’s iconic color and sweetness.

The Grimace Birthday Shake features vanilla soft serve and berry flavors and has a purple hue.

The meal comes with a choice of a Big Mac or a 10-piece McNugget meal and fries.

McDonald’s is encouraging fans to celebrate Grimace’s big day with a donation to Ronald McDonald House Charities. On Tuesday and Wednesday, fans can visit McDonald’s Instagram story and share a photo of their favorite birthday memory via the “add yours” sticker. For every picture shared, McDonald’s will donate $5 to RMHC up to $200,000.

Grimace is one of the original McDonaldland characters. The mysterious, playful purple monster made his debut in June 1971.