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:

Britney Spears and her kids Sean Preston and Jayden James
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Britney Spears and her kids Sean Preston and Jayden James
Love when we go to our favorite spot on Sundays ๐Ÿ’•๐Ÿฅž The boys are bigger than me now!!!!! ๐Ÿ˜œ
Painting feels so therapeutic to me! Getting to do this with my boys on a beautiful day like this is such a blessing!!!
This was from our lil trip to see Aladdin. What a great show!!!!
๐Ÿ ๐Ÿฆ‹๐Ÿ  So much fun at this beautiful place
Me and my boys enjoying the warm weather!!! ๐Ÿ•ถ๐ŸŒด๐ŸŒŠโญ๏ธ
Jumping for joy because school is out for the holidays!! ๐ŸŽ„
Enjoying the holiday break! ๐Ÿ‘Ÿ๐ŸŽ
Going for a walk with my son and the dog always does wonders for my mood...
My favorite boys at my house for Thanksgiving!!!! ๐Ÿฆƒ๐Ÿฆƒ
I did this shoot two years ago with my friend @glennnutley... I remember being on my knees, making sure my sonsโ€™ hair stayed straight!! #FBF
Dinner with the boys!!! ๐Ÿ”๐Ÿ”๐Ÿ”
I took these photos of my children before my trip this summerโ€ฆ looking back at the photos I've taken of them, it brings me to my knees everyday to see how blessed I am to have such amazing and inspiring kids!!!!! Letโ€™s stay inspired y'all!!!!! โค๏ธ
My boys!!! #tbt
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!!
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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