Sister, Sister: Which Congresswomen Pledged Sororities -- PICTURES

Sen. Mary Landrieu, D-La., was a Delta Gamma sister at Louisiana State University. She's also joined in the sorority by Rep. Jo Ann Emerson, R-Mo. -- PHOTO: CHIP SOMODEVILLA/GETTY IMAGES (PHOTO: CHIP SOMODEVILLA/GETTY IMAGES)

Sen. Lisa Murkowski, R-Alaska, was a member of the Pi Beta Phi sorority. One of her sisters? Sen. Kay Bailey Hutchison, R-Texas, who studied at the University of Texas at Austin. (PHOTO: CHIP SOMODEVILLA/GETTY IMAGES)

Rep. Kathy Castor, D-Fla., is Congress's only Tri Delt -- a member of the Delta Delta Delta sorority. -- PHOTO: ALEX WONG/GETTY IMAGES (PHOTO: ALEX WONG/GETTY IMAGES)

At Brooklyn College, Sen. Barbara Boxer, D-Calif., was a sister of Delta Phi Epsilon. Other members of the sorority include Reps. Susan Davis, D-Calif., and Jan Schakowski, D-Ill. -- PHOTO: CHIP SOMODEVILLA/GETTY IMAGES (PHOTO: CHIP SOMODEVILLA/GETTY IMAGES)

At Dartmouth, Sen. Kirsten Gillibrand, D-N.Y., joined Kappa Kappa Gamma. Another sister in the sorority is Rep. Shelley Moore Capito, R-W.Va. -- PHOTO: CHRIS HONDROS/GETTY IMAGES (PHOTO: CHRIS HONDROS/GETTY IMAGES)

Kappa Alpha Theta has a sister on Capitol Hill in Sen. Claire McCaskill, D-Mo., who pledged at the University of Missouri. -- PHOTO: BRENDAN HOFFMAN/GETTY IMAGES (PHOTO: BRENDAN HOFFMAN/GETTY IMAGES)

Rep. Lynn Woolsey, D-Calif. (right) is a sister of theUniversity of Washington chapter of the Alpha Phi sorority. -- PHOTO: CHIP SOMODEVILLA/GETTY IMAGES (PHOTO: CHIP SOMODEVILLA/GETTY IMAGES)

You've seen which congresswomen pledged sororities; check out which congressmen pledged fraternities. (Alex Wong/Getty Images)