Pillow fights and feathers, overdosin’.

Britney Spears’ song “Slumber Party” became her reality Friday night, as she was seen cozying up in bed with Kim and Khloé Kardashian, 41, in two selfies posted to Instagram.

The “Toxic” singer, who was joined by her longtime manager, Cade Hudson, appeared to be visiting the SKIMS founder’s Hidden Hills home.

“Calabasas nights,” Kim, 45, wrote atop the first image in her Instagram Stories. She struck her signature pose as Spears, 43, stuck out her tongue in the cheeky snap.

The second photo, taken by Hudson, showed the four sitting next to each other in the bedroom, with a large, pink mood light behind them. Kim sported a black robe with her hair in a slicked-back bun. Khloé, on the other hand, opted for a pair of Christmas-themed pajamas and w

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