Natalie Portman Pregnant? PHOTOS: Vanity Fair Oscars Party 'Maternity Frock' Sparks Baby Bump Rumors, Expecting Baby No 2 with Hubby Benjamin Millipied?

Following the 85th annual Academy Awards held in L.A. on Sunday (Feb. 24), actress Natalie Portman and hubby Benjamin Millipied were spotted at the prestigious Vanity Fair post-Oscars party at the Sunset Tower in Hollywood. The adorable pair posed for several pics, and while the couple's prominent romantic chemistry was on full display, Portman's white, empire-waisted Dior gown also managed to raise some curious eyebrows. Several gossip sites have since referred to the "Black Swan" starlet's after-party attire as a "maternity frock" reminiscent of the 31-year-old's baby-bump friendly Rodarte dress she wore to the 2011 Oscars. So are the rumors true - is Portman pregnant with her second child?

Check out Portman's stunning white dress Oscars party attire that's currently stirring some baby buzz talk on the web:

Is the stunning Dior spokeswoman attempting to hide something under that beautiful, flowing frock?

Now check out Portman's purple Rodarte dress that she wore at the 2011 Oscars (this is when she was pregnant with son, Aleph Portman-Millepied):

Portman gave birth in June 2011, and she Millepied married in an intimate Jewish ceremony on August 4, 2012.

Are the newlyweds already expecting baby no 2? What do Mstarz fans think, is there a growing baby bump under that classic white gown? Or is this dress simply just mommy-friendly?