Love was not invited to the marriage and even had no knowledge about it, reported E! Online.
"Courtney loves Isaiah, but was devastated to learn that Frances had gotten married without her knowing," a source said.
"Courtney really likes Isaiah and is very happy for Frances. Courtney is sad she wasn't at the wedding. Frances called her after but understands why she did it," the insider added.
The development has apparently not caused a rift between Frances Bean, 23, and Love.
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A source said Frances Bean had been planning her wedding for over a year.
The ceremony included 13-15 guests, and the insider explains that the young star's inspiration for the theme of the wedding was daisies in mason jars.
Although Frances Bean and her mother have had a tumultuous relationship in the past, the Hole frontwoman and her daughter exchanged kind words on social media recently.
"My greatest love and our precious Bean #missyou #memories," she wrote of the throwback pic in which she and Kurt are lying in bed with their baby girl.
"Makes me feel so sad. Our baby is all grown up now. Jesus Kurt look at her face, what on earth were you thinking..?!" she wrote of another similar shot, adding, "God I miss you, we all miss you.