Don't you just love Google! This Sig Ep connection to "Not-Jenna" turned up in a routine search.
"Republican insiders are curious about first daughter Barbara Bush's new boyfriend, Yale senior Jay Blount."
"...Blount was a founder of the school's new Sigma Phi Epsilon fraternity..."
Bush daughter romance blossoms at Yale
..also, and by way of confirmation, this article from the "Yale Daily News" (April 25, 2003):
New frat Sig Ep seeks diverse brotherhood
..and in case you wonder, double entendres are always "entendre'd"