Well here's my take on it! Looks like a fun group.
1. Sarah Michelle Gellar - She's Buffy... That's my reason. Moving on. But if I were to give a reason, she's the second tallest (Not by a lot) and seems to be the most intimidating among them, just in terms of endurance and strength. I think she'd make a fine fighter and would beat everyone here, usually without too much trouble. Surprisingly I think No. 3 Eva would give her the most trouble just out of her hustle, but still I think Gellar would beat her back.
2. Katie Holmes - So I really only have Katie here because she has a large height advantage over her opponents. That and I don't think her opponents are the top of the top when it comes to fighters. Eva would certainly take Katie too her limit and probably beat her 4/10 times. But I think the length on Holmes keeps her in a fight despite her seemingly frailness. I think whatever mindfuckery Tom Cruise put her through has probably got her mind pretty strong, at least after dealing with that whole mess. So I think she's got good focus, a good gameplan and can beat anyone on this list besides SMG.
3. Eva Longoria - I actually originally typed this with Eva at 5! But the more I typed the more I kept changing my mind and rethinking things. The tiny latina! Gorgeous, but small I can see Eva actually putting up a good fight against anyone on this list. But not always winning, especially when it comes to the two stars ahead of her. I think her small size plays a part in that, though I think her fire keeps her in fights. Eventually though, I think she simply runs out of gas and is forced to tap to whoever's got her trapped or cornered or put in a submission hold. Not a bad fighter but held back by her stature.
4. Jennifer Love Hewitt - Honestly I think she takes Eva to the limit if they were to have a best of 10. But the Desperate Housewives star beats her out of sheer determination. I think Hewitt is sorta a middle of the road fighter. Moderate fire, good body, great chest that's for sure, but lacking the "Oomph" or "Spark" that other women just seem to have that I think would help them win fights. I see Jen as someone who's their to do a job and try to do her best, but if she fails she fails. She'll still try but it's not all or nothing for her.
5. Rachel Stevens - So admission time. When I voted on this poll, I put Stevens as one of the two strongest... But that's because I looked at one misleading picture and thought, "Oh she looks formidable". But after seeing her vote count and re-reading her height... Yeah I had second doubts. She still looks fit, but she's small and definitely looks like someone who would have trouble fighting back or finding that angry spark to propel them back into a fight. Still beats Reese though.
6. Reese Witherspoon - I've always found Reese to be a model jobber. Short, petite and known for good girl or ditzy rolls like Legally Blonde. I know she's a very diverse and talented actresses but that kind of role, has always stuck with me for her. I can't see her doing well whatsoever in a fight unless she's up against Ariana Grande or Alexis Bledel. I feel like she's actually probably a bit tougher now then she was when she was younger, but I still think she lacks any fire to win a fight.