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It was all in fun, of course! Here's what went down yesterday, according to a press release for the event:

Lindsay Lohan and baby sister Ali camped out poolside at the MUSCLE MILK FITNESS RETREAT for a private boxing session with trainer Jarett Del Bene. Lindsay got her hair done in the ALTERNA salon while baby sister Ali went into the ECOYA Spa to grab a CARASION treatment. On her way out Lindsay got bejeweled in a YASMIN + JAZMIN black diamond cuff bracelet and matching ring. Before she left, Lindsay grabbed a 4 EVER CLEAN goodie bag with an ECOYA lemongrass candle and diffuser set for her house!

Wait, which house?