yes Katarina Storch is her younger sister
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Olivia Holt and Claire Holt are not related.
no
She did before she started "Kickin' It" :)
The brand of bikinis actress and singer Olivia Holt wears are not listed. Try asking her via Twitter
US actress Olivia Holt (Girl vs Monster) is 20 years old (born August 5, 1997).