My takes on this bracket

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Selena Gomez Vs Emilia ClarkeWinner: Selena Gomez - So I went back and forth on this one a bit, I think Emilia may be a slightly better fighter with better aggression, but I think Selena's size give's her an advantage over the Brit. I think this is a very close fight, but I give the edge to Gomez just barely. I think Selena wears her down and eventually pins her to the mat. But there's no way Selena gets out of this without bruises.
Miley Cyrus Vs Ashlee SimpsonWinner: Miley Cyrus - This one I think is pretty one-sided. Miley's mix of crazy and strength lets her dominate the super slender Ashlee and throw her around. Ashlee comes in thinking she's tougher then she is and Miley just wrecks her right out of the gate.
Ashley Tisdale Vs Taylor MomsenWinner: Ashley Tisdale - I think this is somewhat similar to the fight above, except Tisdale has a harder fight against Momsen's size and length. In the end though, Ashley's tenacity and ferocity puts her over Momsen who I also think thinks she's "tough". Ashley has a more concentrated ferocity compared to Miley and uses it to pick Momsen apart piece by piece, grinding her down and getting her onto the floor where she dominates the rest of the fight.
Stefanie Scott Vs Mischa BartonWinner: Mischa Barton - My thoughts on Barton are a bit mixed, but I think she's a solid fighter. Scott has potential but isn't there yet, and Barton's experience leads her to a win over the young star. Barton's height helps a lot here, but I think even at the same height Barton wins this fight.
Natalie Portman Vs Alexis BledelWinner: Natalie Portman - As I'm typing this these two are tied

! I'm a bit shocked to be honest. I always thought of Alexis as the definition of a jobber and even though I never thought of Natalie as elite, as I always saw her as a solid fighter. So seeing them tied is surprising, but thats what makes these polls so fun! I think Natalie picks Alexis apart throughout a somewhat long but one-sided fight. Natalie's smarts help her here and make-up for their size differential, even though Alexis is as skinny as can be. Both are slender yet Natalie seems like she'd be stronger/in better physical shape. Natalie wins and makes Alexis tap.
Madelaine Petsch Vs Bailee MadisonWinner: Madelaine Petsch- Petsch strikes me as someone who'd be pretty tough even though I don't know too much about the Riverdale star. Madison does not strike me the same way haha. I think Petsch has a dark, angry side that lets her cheap shot her opponent if she's in trouble, and that underhandedness isn't even needed here as she pounds Madison into tapping out.
Victoria Justice Vs Madison BeerWinner: Victoria Justice - This one was surprisingly tough for me. I've always thought Justice was underrated, but I also think Beer is too. I actually voted Beer in the poll part, but after thinking about it some more I've changed my mind. I think Justice pulls out of a grueling, tough and long fight between the two. I think Justice eventually stoops below her good girl gimmick and attacks Beer's massive rack, and Beer taps quickly.
Kelsey Chow Vs Christian SerratosWinner: Christian Serratos - I think Chow seems pretty tough, but not nearly as tough as Serratos. Something about Serratos (Probably her Walking Dead role) screams tough girl (almost like Michelle Rodriguez lite). Serratos gets a hell of a fight out of Chow but pulls out of it the winner, wrapping Chow's hair in a knot and mounting her from above. Chow finally taps out after a surprising amount of punishment from Serratos and slinks off disappointed.