For the first time, one "American Idol" replaces another at No. 1 on the Billboard 200 as Adam Lambert's "Trespassing" debuts atop the list with 77,000 sold, according to Nielsen SoundScan. His arrival bumps last week's leader, Carrie Underwood's "Blown Away," to No. 3 (54,000; down 55%). Lambert ­finished in second place on the 2009 season of "Idol" while Underwood won the 2005 edition.

It's Lambert's first No. 1 album and his second major-label studio set. It ­follows 2009's "For Your Entertainment," which debuted and peaked at No. 3 with 198,000 sold in its first week. It was blocked from No. 1 by Susan Boyle's "I Dreamed a Dream" (a debut at No. 1 with 701,000) and Andrea Bocelli's "My Christmas" at No. 2 (218,000).

And now, for the bad news. The 77,000 start for "Trespassing" is the smallest sum at No. 1 on the chart since Aug. 20, 2011, when Adele's "21" sold 76,000 in its 12th nonconsecutive week atop the list. Trespassing has the smallest sales week for a No. 1 debut since Amos Lee's "Mission Bell" started in the penthouse with 40,000 on the Feb. 12, 2011, chart.

More fun "Idol" facts: Lambert is the seventh "American Idol" finalist to reach No. 1, following Underwood, Kelly Clarkson, Ruben Studdard, Clay Aiken, Chris Daughtry (of Daughtry) and Scotty McCreery.

Further, as an American Idol rules the chart for the third straight week, it's the longest that the show's spawn has monopolized the No. 1 slot. There have been two-week runs atop the list, but from a single album-like Underwood's "Blown Away" in the past two weeks.

gay pride: Adam Lambert also brings gay pride to No. 1 on the Billboard 200 this week, as he arguably becomes the first out gay man to have a No. 1 album.

Lambert came out in a cover story in Rolling Stone magazine in June 2009 - shortly after he finished in second place on "American Idol." His family and friends knew beforehand, but "Idol" audiences were in the dark about his sexuality.

Now, here's where Lambert's achievement requires a few caveats.

First, while other gay singers have been No. 1, they've done so before they came out to the public. That's a key achievement in Lambert's feat on the Billboard 200.

For example, Lambert's fellow "American Idol" alum, Clay Aiken, debuted at No. 1 in 2003 with his first album (and so far only No. 1), "Measure of a Man." However, he didn't come out until five years later, in People magazine.

As for some other notable out stars: Elton John had seven No. 1 albums between 1972 and 1975-years before he announced he was bisexual in Rolling Stone in 1977. (He later said he was gay in the '80s.) He's never had a No. 1 since. George Michael's two No. 1 albums ("Faith" and Wham's "Make It Big") arrived more than a decade before he came out as gay. Michael Stipe of R.E.M. first said he was "queer" in the early 2000s-years after the band notched its two No. 1s with "Out of Time" (1991) and "Monster" (1994).

In more recent times, rock band Vampire Weekend debuted at No. 1 in January 2010 with "Contra" - a month before the quartet's Rostam Batmanglij came out in Out magazine.

Second, at least two artists said they were bisexual before they reached No. 1. Both Lady Gaga and Green Day's Billie Joe Armstrong stated they were before either act landed a No. 1.

Gaga told Rolling Stone in 2009 that she was bisexual and then later explained to Barbara Walters in a separate interview that "Poker Face" was about how she would fantasize about women while in a relationship with her boyfriend. When pressed by Walters, Gaga said she had "sexual relationships with women" (but had never been in love with a woman). Last year, Gaga notched her first No. 1 album with "Born This Way."

Armstrong explained to the Advocate in 1995 that he was bisexual-the year after he married his wife, Adrienne. Since then, his band earned its two No. 1 albums - 2004's "American Idiot" and 2009's "21st Century Breakdown."

However, 15 years after Armstrong effectively came out, he told Out magazine in 2010 that he's unsure if he'd refer to himself as bisexual, adding, "But I'd never say that I'm not. I don't really classify myself as anything. And when it comes to sex, there are parts of me that are very shy and conservative. I want to respect my wife."

I'm certainly not about to get into the business of "what is or isn't gay and/or bisexual 'enough.'" But, Lambert's No. 1 debut is certainly something to be proud of. And it's made all the more relevant considering June is Lesbian, Gay, Bisexual and Transgender Pride Month.