"The pair went for a short swim, hugged and had lots of body contact in the pool. They kept to one side of the pool where there was the most covering from prying eyes," the eyewitness recalled, noting that Rivera and Spade were joined by Adam Sandler, Rob Scneider and their families. "Outside of the pool, they sat on lounge chairs and talked animatedly. They spent about an hour poolside together.”
As for whether they're a hot new couple, a source told ET, "It's very casual and they had a fun time together."