Brit opened the show saying: "I have a very special guest tonight... Lady Gaga is here." Gaga, then stood up and started bowing and sending air kisses to Britney, while she hearted her right back. Ahhhhh pop princess love in.
Gaga honoured Britney's performance wearing a leather biker cap and black bra. Just your average Sunday night then. See more of Gaga's memorable fashion moments in the gallery below.
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