It's the boobie battle you've all been waiting for -- 22-year-old "Teen Mom" porn star Farrah Abraham (with her brand new D cups) and the legendary Tanning Mom (with her genuine leather speed bags).

It's actually a hilarious coincidence ... Farrah and 45-year-old Patricia Krentcil both posed for topless photo shoots on the beaches of Malibu Thursday.

Malibu beaches are a hot spot for celeb photo shoots, so it's not that surprising they showed up around the same place -- but it's incredible they BOTH decided to drop their tops.

Tanning Mom Exposed Gallery Launch Gallery INFphoto.com

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