11/01/2012 at 09:00 AM EDT
is younger than you think – at least in the way she feels.
Though Thursday marks her 40th birthday, the Playboy cover girl
told PEOPLE, "I sadly have the same thought that my parents say every birthday which is, 'I don't feel that old.' So, I have decided to make my mindset 40 is the new 15. Okay, fine – the new 22."
And what would be the perfect present?
in my shower right now would be a pretty awesome birthday gift," she jokes in her blog for the Chicago Sun-Times
In Las Vegas on Wednesday night she dressed as a "cougar" – a joke, considering her age. The ever-youthful McCarthy headed to town with her sister (also dressed as a cougar) to celebrate her birthday at Gallery Nightclub.
But one person you won't see with her any time soon is a boyfriend, though she has singled out a familiar face that she's "courting."
"I have not met anyone yet that is a potential love," she said. "I have myself under construction. I'll let you know when the roads are clear and reopened."
Since splitting in August
with Chicago Bears linebacker Brian Urlacher, her boyfriend of five months
, McCarthy still has an open mind about finding romance.
"I'm in love with falling in love. I have come to realize, though, that I need to practice what I preach and learn to love myself completely before I love someone else," she said. "So, I've been courting myself and having a great time with me, myself and I."