Clay Aiken

His coming-out announcement generated the most headlines, but for Clay Aiken, the biggest moment of 2008 was the birth of his son, Parker, now 4 months old.

"At the end of the day, Parker is the most important thing of the year, and of my life, without question," Aiken tells People. "Having a son and that type of responsibility is obviously going to be something that I remember forever."

Aiken welcomed Parker with best friend and record producer, Jaymes Foster, on Aug. 8. A month later, father and son posed for the cover of People, with Aiken finally acknowledging his sexuality after years of speculation.

Since then, the American Idol alum has been "warmed" by the heaps of support he's received and "humbled" knowing he may have inspired others to come out. "I really don't know what to say about that," Aiken, 30, says. "I think that hopefully less than inspiring people I will have an opportunity to open people's eyes to different viewpoints and different possibilities in their life."

As for the new year, Aiken, whose run on Broadway as Sir Robin in Monty Python's Spamalot finishes Jan. 4, plans on putting his career on the backburner to focus on Parker.

"We'll take a little bit of time, we're not quitting or anything, we're just gonna take it slow for a month or so and recollect once I get back," he says. "I may never have any free time once Parker starts walking and talking!"