Toronto-based Drake and his just-released album, "Thank Me Later," debuted on top of the Billboard 200 charts with impressive sales of 447,000 copies this past week.

Drake’s latest CD is third best debut this year in terms of first week sales after Sade’s "Soldier Of Love" (502,000 copies) and Lady Antebellum's "Need You Now" (481,000). "Thank Me Later" is also the second biggest selling debut album of 2010 next to Susan Boyle, whose "I Dreamed A Dream" moved 701,000 units in retail.

In the singles chart, Katy Perry featuring Snoop Dog maintains her hold on the Hot 100 with “California Gurls.” Perry also lords it over the Digital Sales chart for the same song with 337,000 downloads sold.

Usher featuring will.i.am, and B.o.B. featuring Hayley Williams of Paramore likewise hold on to the number two and three spots with “OMG,” and “Airplanes,” respectively. Travie McCoy featuring Bruno Mars is also a holdover from last week’s countdown as “Billionaire” stays put at number five.

Up a notch from last week is Drake with “Find Your Love” who comes in this week at number six. Ke$ha, meanwhile, hovers outside the top five with “Your Love Is My Drug” which stays put this week at number six.

Lady Gaga is two steps down the singles chart ladder this week as “Alejandro” moves from number five to seven. Nevertheless, she holds court in the the Dance/Electronic album chart with her “The Fame” and “The Fame Monster” albums at number one and two positions, respectively.

This week’s biggest gainer in the top ten is new entry Mike Posner with “Cooler Than Me” which moves up six notches from fourteen to number eight.

Eminem’s former number one single, “Not Afraid,” is down a step from number eight to nine while Taio Cruz's “Break Your Heart” dives from number seven to ten.

Billboard Hot 100

(1) “California Gurls” – Katy Perry feat. Snoop Dog

(2) “OMG” – Usher feat. will.i.am

(3) "Airplanes” – B.o.B. feat. Eminem and Hayley Williams of Paramore

(4) “Billionaire” – Travie McCoy feat. Bruno Mars

(5) “Find Your Love” - Drake

(6) “Your Love Is My Drug” – Ke$ha

(7) “Alejandro” – Lady Gaga

(8) “Cooler Than Me” – Mike Posner

(9) “Not Afraid" – Eminem

(10) “Break Your Heart” – Taio Cruz

Billboard 200 Top Ten Albums

(1) “Thank Me Later” - Drake

(2) “Mojo” – Tom Petty and The Heartbreakers

(3) “Law Of Illusion” – Sarah Mclachlan

(4) “Now 34” – Various Artists

(5) “To The Sea” – Jack Johnson

(6) “Twilight Saga: Eclipse” - Soundtrack

(7) “My World 2.0” – Justin Bieber

(8) “Need You Now” – Lady Antebellum

(9) “Bionic” – Christina Aguilera

(10) “Glee: The Music, Journey To Regionals” - Soundtrack