Get ready for a double dose of sexy!



For the first time in the 50-year history of the Sports Illustrated Swimsuit Issue, the magazine has not one, but two sizzling covers.





[Related: Check Out All the 2014 Sports Illustrated Swimsuit Models]

Last Thursday night, Sports Illustrated unveiled the front shot, which features a trio of lovely ladies — Nina Agdal, Lily Aldridge, and Chrissy Teigen — looking over their shoulders as they smile for the cameras in the Cook Islands sporting bright, barely-there bikini bottoms.

But since it's the 50th anniversary of the iconic annual swimsuit issue, the mag decided to do something extra special for the occasion, which is why it has released a flip side adorned with none other than Kate Upton.

[Related: See More Hot Pics of Kate Upton]

The 21-year-old blond bombshell — who also graced the cover of the SI Swimsuit Issue in 2012 and 2013 — has scored a three-peat with her latest appearance on the back cover on which she pours her killer curves into a coral-colored string bikini. As usual, Upton is a swimsuit showstopper and lets her bodacious bod do the talking while she shoots the camera a come-hither look.

Earning yet another coveted cover spot has put Upton into some elite modeling company. The only other models to have appeared on the cover of the Sports Illustrated Swimsuit Issue at least three times are Elle Macpherson (1986-88, 1994, and 2006), Cheryl Tiegs (1970, 1975, and 1983), Christie Brinkley (1979-81), Kathy Ireland (1989, 1992, and 1994), and Daniela Pestova (1995, 2000, and 2006).

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[Related: Sports Illustrated Swimsuit Stunners: Then and Now]

Though it's certainly hard to compete with Kate — everyone's favorite blond bombshell of the moment — the 2014 "dreamy team" consisting of Nina, 21, Lily, 28, and Chrissy, 28, is also seriously sexy. Which cover do you think is hotter?