Aldrin and his now-wife, Dr. Anca Faur, tied the knot in a private ceremony in Los Angeles.
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The former astronaut posted photos on his Twitter account, saying the two were "as excited as teenagers."
"On my 93rd birthday & the day I will also be honored by Living Legends of Aviation I am pleased to announce that my longtime love Dr. Anca Faur & I have tied the knot," read the tweet.
Aldrin made three spacewalks as pilot of the 1966 Gemini 12 mission.
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He's been married three times before. Faur holds a Ph.D in chemical engineering.