Abdul sued Lythgoe in December claiming the producer sexually assaulted her on two occasions.
Paula Abdul and others have sued the TV personality for sexual assault, which he's denied.
Siwa, who also served as a judge in 2022, will replace Lythgoe for the upcoming 18th season.
Lythgoe co-created the dance competition series, on which he served as a judge for its first 16 seasons.
The TV producer was previously accused of assault by Paula Abdula last week.
Abdul is suing ‘American Idol’ and ‘So You Think You Can Dance’ producer Nigel Lythgoe for alleged sexual assault, which he denies.
The former 'American Idol' judge claims Lythgoe sexually assaulted her on two occasions.
The producer also thinks the show should move to New York to have Ryan Seacrest host.
The OG 'American Idol' producer reveals he wants to see Bruno Mars on the judges' panel.
The actress will join Nigel Lythgoe and Mary Murphy as a judge for the show's 14th season.
The 'Dance Moms' star will officially help crown America's Favorite Dancer for season 13.
ET stopped by the NYC auditions of 'SYTYCD' to get the season 12 scoop from new judges Abdul and Jason Derulo.
Tara Lipinski guest judges on So You Think You Can Dance and the Olympic skater took us behind the scenes!
Cat Deeley's Least Favorite 'SYTYCD' Moment
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