Lindsay is yet to confirm her engagement to Egor, but has rarely been seen without a huge sparkling emerald and diamond ring on her finger in the last few months.
Even as the pair embraced in the water, the ring was again still visible on her left hand.
Since her rough rehabilitation for a series of drink related offences, the Parent Trap star has been making efforts to get her life back on track.
She relocated to the UK last year after appearing in West End play, Speed the Plow.
She even weighed in to the Brexit debate in June by live-tweeting the results on her Twitter page – causing controversy for not knowing where Kettering was.
However, she was offered an olive branch from the town after accidentally offending people with her tweets, and she is now set to turn on their Christmas lights at the end of the year.