King Pharrell Williams' ™ 'Happy' Hits No. 1 On Hot 100 - Queen Bey Holds Steady at #5

After two weeks at No. 2, the song rises to the top, dethroning Katy Perry's 'Dark Horse,' featuring Juicy J, after four weeks at the summit. Plus, John Legend lands his first top 10.

Clap for Pharrell Williams, whose bouncy single "Happy" reaches the top of the Billboard Hot 100 with a 2-1 rise. The song unseats Katy Perry's "Dark Horse," featuring Juicy J, which reigned the past four weeks (and despite the release of the latter's song's video last week). Meanwhile, John Legend earns his first Hot 100 top 10 with "All of Me."

As we do each Wednesday, let's run down the numbers behind the Hot 100's top 10.

Williams claims his fourth Hot 100 No. 1, but first as a lead artist. He'd previously ruled as a featured act on Snoop Dogg's "Drop It Like It's Hot" (three weeks, 2004); Ludacris' "Money Maker" (two weeks, 2006); and Robin Thicke's "Blurred Lines" (also featuring T.I.; 12 weeks, 2013). (Technically, Williams boasts one other "Number One" on the Hot 100: his song "Number One," featuring Kanye West, reached No. 57 in 2006 …)

With Williams having first graced the Hot 100 the week of March 2, 2002 (as a guest, with Diddy, on Busta Rhymes' No. 11-peaking "Pass the Courvoisier Part II"), he waited 12 years and a week (as this week's chart is dated March 8) for his first Hot 100 topper as a lead act. He closes the longest interval between an act's first chart entry and first No. 1 as a lead since Dr. Dre needed 15 years and three weeks from 1993's No. 2 hit "Nuthin' But a 'G' Thang" to 2009's "Crack a Bottle," on which he shares lead billing with Eminem and 50 Cent. (In between, Dre spent four weeks at No. 1 in 1996 as a featured act on Blackstreet's "No Diggity.")

Below the top two, Jason Derulo's "Talk Dirty," featuring 2 Chainz, logs a third week at No. 3 on the Hot 100. The cut backtracks 2-3 on Streaming Songs but with a 5% lift to 6.9 million. It rises 15-13 on Radio Songs (75 million, up 13%), while holding at No. 3 on Digital Songs (247,000, down 7%).

John Legend leaps to his first Hot 100 top 10, as "All of Me" vaults 11-4. The piano ballad notches a second week at No. 4 on Digital Songs (203,000, up 24%) and pushes 11-6 on Streaming Songs (4.5 million, up 26%) and 18-14 on Radio Songs (71 million, up 26%). While the song has become entrenched at R&B radio, leading Adult R&B songs for a fourth week this week, its profile and sales have soared after Legend sang it at the Grammy Awards on Jan. 26.

Rounding out the Hot 100's top five, Beyonce and featured artist/husband Jay Z hold at No. 5 with their No. 2-peaking "Drunk in Love." With a 12-9 advance on Radio Songs (92 million, up 9%), the track becomes Beyonce's 15th top 10 on the tally (and first since Lady Gaga's "Telephone," featuring Beyonce, in 2010) and Jay Z's 17th. (Beyonce notched another 10 Radio Songs top 10s with Destiny's Child in 1999-2005.)

ONTD, what's your favorite track off G I R L?