by POPSUGAR Celebrity 23

We've entered round four of this year's Hottest Summer Bikini Body contest, and we're down to the last eight ladies after you guys cast your votes. A few of the races are really heating up, and here's a rundown of how the competition looks for the remaining contestants:

• Jennifer Aniston vs. Marisa Miller: Jennifer and Marisa are currently in the closest race of all — the Marley and Me star has an edge on the Victoria's Secret model by less than 50 votes!
• Jessica Alba vs. Miranda Kerr: The Angels don't appear to be doing too well — Jessica has the edge on Miranda!
• Cindy Crawford vs. Kim Kardashian: Cindy Crawford has a lot more experience modeling bikinis, and in this case it's paying off — she's beating Kim by a few hundred votes.
• Bar Refaeli vs. Gisele Bundchen: In a matchup between two models, only one will prevail — and right now it looks like that person will be Bar, who's beating Gisele by the widest margin of all.

Make sure to get your votes in before this round closes on Thursday at midnight! Once you're logged in and have completed the bracket, you'll be entered to win an iPhone! Check out the full list of rules here.