The pair are planning a small, intimate ceremony with only a few close friends and family.
Following the California Supreme Court's monumental ruling that same sex couple's have the right to marry, DeGeneres announced she planned to wed her longtime girlfriend on a taping of her show in May.
"It's something that we've wanted to do and we want it to be legal and we are very, very excited," DeGeneres, 50, gushed to Us Magazine.
Watch Ellen's emotional engagement announcement.
DeGeneres reflected on their upcoming nuptials at the Daytime Emmy Awards in Hollywood in June.
"I think someday people will look back on this like women not having the right to vote and segregation and anything else that seems ridiculous that we don't all have the same rights," DeGeneres said.
Of the preparations, DeGeneres joked, "Planning a wedding is very stressful. It's crazy. My gardener is now invited."
DeGeneres and De Rossi began dating in December 2004.
"I feel like I found my perfect fit," DeGeneres said of De Rossi in an interview with the Advocate.
"She’s taught me lessons about myself, and I feel like I’ve taught her," DeGeneres added.
Ellen and Portia are great role models to the lesbian community, especially for younger queer women who may not have strong gay role models in their lives. They are proof that it is possible for lesbians to have a long-term relationship, get married and live a normal life like any other monogamous couple.
Lesbiatopia would like to wish Ellen and Portia the utmost happiness on their special day and the continued love and support that they have shown each other from the beginning.