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Ke$ha

GREAT ASS

... Or Optical Illusion?!!?

10/4/2013 7:21 AM PDT BY TMZ STAFF

1004_kesha-instagram-03aHoly crap ... Ke$ha just posted some racy new lingerie pics ... and she looks INCREDIBLE!!!

Butt ... did the pop star really tone up her body -- or are the new pics the result of some creative camera work?

1004_kesha-instagram-02a
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Here's the deal -- Ke$ha posted the pics on her Instagram page yesterday, which feature the singer showing off her G-string'd ass in various sexual poses.

In the pics, Kesh looks WAYYYY different than she did strolling the beach back in 2011 (see below).

1004-kesha-2011-PCN

So, the question ...

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