Hairspray, Prince Can't Dislodge Now!

Now that's what I call a title defense!

Despite a 33 percent drop-off from its debut week, a surging Hairspray soundtrack and a new release by Prince, Now That's What I Call Music! Vol. 25 held its hits grip on the top spot for a second week. The hits collection finished the week ended Sunday selling another 149,000 copies, per Nielsen SoundScan figures. The disc's two-week tally reached 372,000.

By spending its first two weeks at number one, the latest edition accomplished a feat not seen by the series since Now! 22. That disc, released in July 2006, eventually spent three of its first four weeks on top, displaced during week three by former Destiny's Child singer LaToya Luckett.

With the film still a strong performer at the box office, the Hairspray soundtrack continues to rocket up the Billboard 200. After leaping 16 spots a week earlier, the disc climbed another two to finish at number two on 101,000 copies.

The Hairspray soundtrack includes film highlights like Zac Efron's "Ladies' Choice," James Mardsen's "The Nicest Kids in Town," Queen Latifah's "Big, Blonde and Beautiful" and the John Travolta-Christopher Walken collaboration "(You're) Timeless to Me."

Prince, whose previous album, 3121, was his first to open at number one spot, failed to duplicate that achievement with Planet Earth. The Purple One's latest, featuring such blasts from the past as Sheila E., Wendy and Lisa and former New Power Generation members, moved 96,000 copies at number three.

The album caused a stir in the U.K. when it was included for free in the July 15 edition of The Mail newspaper, prompting several retailers to boycott the album. Planet Earth also marks Prince's return to Columbia Records, with whom he controversially bundled 2004's Musicology with concert tickets.

Canadian pop-punkers Sum 41 also opened in the Top 10 as Underclass Hero sold almost 45,000 copies at number seven. This is the first album since Sum singer Deryck Whibley married fellow Canadian artist Avril Lavigne and moved into the Bel-Air home previously owned by Travis Barker during his MTV reality show run.

The Plain White T's, who just topped the Hot 100 with "Hey There Delilah," climbed to the 10 spot selling 39,000 copies of Every Second Counts. Though originally released last year, the album was reissued several months ago to include "Delilah," which had been a major indie hit for the band while on Fearless Records.

Billy Ray Cyrus, who has enjoyed a rival thanks in part to the tween success of his daughter Miley, sold 28,000 copies of Home at Last to debut at 20. The former mullet king costars in Hannah Montana as the father of his real life daughter (who finished higher in this week's countdown, at number four) and had a profile-raising run on last season's Dancing with the Stars.

Hip-hop newcomer Yung Berg made a strong showing at 32 with Almost Famous (The Sexy Lady EP) selling almost 20,000 copies. Less than 30 copies behind, the Marc Anthony-led El Cantante soundtrack opened at 33. Anthony, the bestselling salsa singer ever, portrays salsa pioneer Hector Lavoe in the film, which features wife Jennifer Lopez portraying his onscreen wife.

Twin sisters Tegan & Sara followee at 34, selling 19,000 copies of The Con.

Other noteworthy debuts included Barlowgirl's How Can We Be Silent at 40, Evans Blue's The Pursuit Begins When This Portrayal of Life Ends at 44, Michael W. Smith's Stand at 50, Hanson's Walk at 56, Garbage's hits collection Absolute Garbage at 68, Silverchair's Young Modern at 70 and the new Yeah Yeah Yeahs' EP Is Is at 72.

Overall, album sales were down almost 2 percent from last week and nearly 13 percent when compared to the same week last year.

Here's a rundown of the Top 10:

1. Now That's What I Call Music! 25, various
2. Hairspray soundtrack, various
3. Planet Earth, Prince
4. Hannah Montana 2: Meet Miley Cyrus, Miley Cyrus
5. T.I. vs. T.I.P., T.I.
6. The Dutchess, Fergie
7. Underclass Hero, Sum 41
8. Minutes to Midnight, Linkin Park
9. Back to Black, Amy Winehouse
10. Every Second Counts, Plain White T's