Britney Spears may be a train wreck, but she rode the rails straight to No. 1 on the Canadian charts this week.

Spears' new effort, "Blackout," checked in at No. 1 with 29,000 in sales, according to figures compiled by Nielsen SoundScan.

It marks her first No. 1 disc since 2001's "Britney" (which sold 44,000), and her fourth No. 1 album to date.

Her last studio album, 2003's "In the Zone," debuted at No. 2 with 31,000 in sales.

However, the news wasn't so great for Brit in the U.S., where she came in at No. 2 with decent sales of 290,000, but failed to top the charts there for the first time in her career.

Back here, the Backstreet Boys premiered at No. 2 (yes, this is 2007, not 1997), with "Unbreakable" (16,000), Hedley's "Famous Last Words" (13,000) came in at No. 3, and Josh Groban's "Noel" slipped from No. 2 to No. 4.

All the movement up top forced Carrie Underwood's "Carnival Ride" from No. 1 to No. 4, Avenged Sevenfold's self-titled disc entered at No. 6, and Paul Potts' "One Chance" occupied the No. 7 slot.

Andrea Bocelli's "Best of" collection started at No. 8, likewise with Bran Van 3000's "Rose" at No. 9, and James Blunt's "All the Lost Souls" rounded out the top 10 at No. 10.

Other notable debuts included Neverending White Lights' "Act 2: Blood & the Life Eternal" at No. 39, Puscifer's "V is for Vagina" at No. 40, and Buck 65's "Situation" at No. 47.

In the U.S., the Eagles' "Long Road Out of Eden" flew in at No. 1 with sales of 711,000, followed by Carrie Underwood in third, Avenged Sevenfold in fourth, and Josh Turner's "Everything is Fine" in fifth.