Instead of a lavish wedding reception fit for a man making more than $19 million in 2012, Nowitzki tied the knot in a low-key fashion to Olsson at the NBA star's Dallas-area home in Preston Hollow, Tex.
"It wasn't a formal wedding ceremony - and they didn't consider themselves married," Dallas County Judge Craig Smith told the Dallas Morning News.
The July 20 ceremony wasn't the first marriage ceremony for the couple, according to NBC Dallas. Nowitzki and Olsson held a prior ceremony during a Kenyan vacation July 7.
The judge confirmed the nuptials of Nowitzki and Olsson to the paper on Wednesday, nearly three weeks after the star Mavericks forward wed Olsson, whom he met while vacationing in Scotland.
Olsson, 31, was born in Kenya. She is the associate director of the Goss-Michael Foundation art gallery in Dallas, according to the Associated Press.
The wedding was described by the Dallas Morning News as an "intimate ceremony with only a handful of close friends."
Smith said presiding over the couple's nuptials was "a pretty special deal.
"It was very special, and I appreciate their letting me be part of this special day. As my 22-year-old daughter says. 'Are you one of his buds now?'" he said.
Nowitzki and Olsson are spending their honeymoon in the Caribbean, where they will be holding another marriage ceremony for close family members, the paper reported.
Nowitzki, a 34-year-old native of Germany, helped the Mavericks win their first NBA championship in 2011 and is the Mavs' marquee player.