The accused was subsequently arrested, they said.
The victim and her husband were celebrating at the Juhu Chowpatty as the New Year ushered in. At about 1.30 AM, the accused, Hyder Ali, who was a part of the crowd at the beach, touched the victim inappropriately, police said.
"Her husband immediately reported the incident to policemen deployed at the beach," said Arun Chavan, senior inspector of Santacruz police station.
The accused was subsequently caught and taken to police station, where he was arrested for molesting the woman and charged under section 354 of the IPC.
Ali was produced before a local court today where he was granted bail.