Lindsay Lohan's fluctuating weight – which has dropped dramatically in recent months – has long been the subject of press speculation.
But on holiday in the Caribbean at the moment, it's Lindsay's sister Ali's slim figure that has come under the spotlight.
The pair were spotted flaunting their bikini bodies as they caught some rays on board a private boat on Monday.
And 16-year-old Ali looked particularly skinny in a black two-piece ensemble.
The two sisters boarded the lavish boat after a spot of shoe shopping in some of St Barts' high-end designer stores.
Lindsay is just one of a number of Hollywood celebrities currently enjoying a break at the private resort.
Source: Entertainmentwise