Lindsay Swagerty, 23, told the Sun she was thrown fully clothed into the pool at the Andaz hotel's Ivy rooftop bar by one of Harry’s friends.
"Prince Harry was the first to notice me when I got out and he wrapped his towel around me to keep me warm. It was such a gentlemanly thing to do" Swagerty told the Sun.
The encounter didn’t end there.
The Prince and his friends reportedly met up with Swagerty the next night for drinks.
"He is probably the most charming man I'll ever meet," Swagerty told the Sun.
According to club management, Harry will be staying at the Andaz hotel until next Friday.
The British Army Captain arrived last week for a two-month military helicopter training course at the Naval Air Facility at El Centro, Calif. -- a two-hour drive from San Diego -- where he will fly Apache helicopters in the desert near the Mexican border.
The facility hosts allied troops throughout the year because its hot, dusty conditions replicate Afghanistan's harsh environment and the clear weather allows for constant flying.
Harry is among 20 students in the British Army participating in the training that ends at an Air Force station in Gila Bend, Ariz. where they will fire missiles, rockets and cannons from the Apache helicopters.