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"Our dynamic is great. I'm very, very happy. It's a lot of laughing," the actress told PEOPLE at the celebration for the 40th anniversary of Caesars Palace Las Vegas on Wednesday.
When asked about a possible wedding, McCarthy, who has been spending time with Carrey, 44, in the capital of quickie weddings, Las Vegas, said, "No, there is no marriage on my mind – at all."
The weekend of July 28, the couple stayed at the $25,000-a-night Sky Villa in Sin City's Palms Casino Resort. During their three-day getaway, they enjoyed in-room massages and hit the high-roller lounge for some blackjack.
"They looked very happy and very into each other," a witness tells PEOPLE.
McCarthy and Carrey quietly started dating eight months ago, but they've been stepping out in public recently with dates including a June 16 helicopter ride in Santa Monica and outings to Fiona Apple and Radiohead concerts.
Carrey is "an amazing person," McCarthy told Access Hollywood in July.
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