"Our California dream is reality," the former Star Trek star, 71, wrote in a post on his Web site. "Brad Altman and I can now marry. We are overjoyed! At long last, the barrier to full marriage rights for same-sex couples has been torn down. We are equal with all citizens of our state!"
Takei, who came out in 2005, has been with his partner for over 21 years.
"We've shared the good times as well as struggled through the bad," the post says. "He helped me care for my ailing mother who lived with us for the last years of her life. He is my love and I can't imagine life without him. Now, we can have the dignity, as well as all the responsibilities, of marriage. We embrace it all heartily."
With no concrete wedding date set, Takei writes, "For now, Brad and I are enjoying the delicious dilemma of deciding where, when, and how we will be married."
Last week, Ellen DeGeneres declared that she would wed longtime girlfriend Portia de Rossi on a recent episode of her talk show, telling the crowd "I'm very excited."