Farrah Abraham & Tanning Mom Topless Bikini Showdown Battle of the Bulges

6/21/2013 9:30 AM PDT

Farrah Abraham & Tanning Mom -- Topless Bikini Showdown


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.


So we gotta ask ...