Britney Spears, sister Jamie Lynn and all the kids take on Disney World -- and massive milkshakes

These desserts look so dangerously good, you might venture to say they're...toxic.

Britney Spears, sister Jamie Lynn Spears and all their kids headed to Walt Disney World this week and, of course, hit up Cinderella's Castle and Splash Mountain. But they had to duck away from the Magic Kingdom for a critical activity: Downing massive, out-of-this-world milkshakes!

The crew, headed by Britney, got the VIP treatment at the grand re-opening of Planet Hollywood at Disney Springs. Planet Hollywood posted footage of the family walking the red carpet to the screams of hundreds of fans.

In tow were sons Sean and Jayden James, Jamie Lynn's daughter Maddie -- who looks totally on the mend from her scary ATV accident last month -- and brother Bryan's daughter Lexie. Britney's mom Lynne also joined the fun.

The weather wasn't perfect, but the Spears clan still had a blast. Brit posted an Instagram album showcasing the entire day:

Britney has a longtime relationship with Planet Hollywood. In the early 2000s, she often made appearances at the Orlando location to promote album releases (and enjoy the food!). She's currently performing her Vegas residency at the Planet Hollywood Resort & Casino.

See photos of Britney Spears' sons:

27 PHOTOS
Britney Spears' kids Sean Preston and Jayden James
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Britney Spears' kids Sean Preston and Jayden James
Brushy brushy brushy!
My son looks so handsome with his new haircut ๐Ÿ’‡โ€โ™‚๏ธ๐Ÿ’‡โ€โ™‚๏ธ๐Ÿ’‡โ€โ™‚๏ธ๐Ÿ’‡โ€โ™‚๏ธ๐Ÿ’‡โ€โ™‚๏ธ
Before Sky Zone!
Miss my boys ๐Ÿ’˜๐Ÿ’˜
Who wants to go to Texas? โ˜บ๏ธ
No homework! Best day ever!
Right before the boys went to their play last week โ˜ƒ๏ธโ˜ƒ๏ธโ˜ƒ๏ธ #tbt
Family time โ˜€๏ธ
My son received an award at school today for being the best encourager!!
โค
The socks ๐Ÿ˜‚๐Ÿ˜‚๐Ÿ™Š๐Ÿ™Š๐Ÿ’œ๐Ÿ’œ๐Ÿ’œ๐Ÿ’œ๐Ÿ’œ๐Ÿ’œ
Photos of my boys taken about a year ago. They're such lovely young men. It's simply the sweetest gift being a mother
Beautiful parrot in Hawaii!
The boys with @kennybritt18! Vote for him for Pro Bowl!! โ˜บ๏ธ
Church with the family!
My son has blue hair!! Wheeee!
Goodbye Hawaii ๐Ÿ˜ข so sad!
Great Vegas trip!
The boys and I saw @disneythejunglebook this weekend and we give it โญ๏ธโญ๏ธโญ๏ธโญ๏ธโญ๏ธโญ๏ธโญ๏ธ
Time for a haircut!
Fun in Vegas!
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