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Michael Buble performs at the BBC Theatre on October 21, 2009 in London, England. Getty

WHERE 'HAVEN'T' YOU BEEN?: Michael Buble makes his introduction to Billboard's Pop Songs radio airplay chart, where the aptly titled "Haven't Met You Yet" bows at No. 38.

Buble has been a mainstay on the Adult Contemporary survey since Aug. 9, 2003, when he first appeared with a cover of George Michael's "Kissing a Fool." He's logged three No. 1s among his 10 entries on the list, including a three-week reign with "Haven't Met You Yet."

What sets the Canadian crooner's current single apart as the song that crosses him over to mainstream top 40 radio?

"Young, hip women love this guy," says Jeremy Rice, program director of Pop Songs panelist WBLI/Nassau-Suffolk, New York, which played the song 45 times in the chart's tracking week.

"He is an international pop star. The U.S. is just a little late getting to the party.

"But, that's OK. I'll take the ratings."

Helping his cause, Buble recently served as the musical guest, and made an acting cameo, on "Saturday Night Live," and the cast of "American Idol" performed "Haven't Met You Yet" as a group to open the show's March 12 episode. Buble's current album, "Crazy Love," has sold 1,574,000 copies in the U.S. since its October release, according to Nielsen SoundScan. He has sold 11.5 million albums in his career.

Jeff McCartney, programming and content director of KZHT/Salt Lake City, which led all Pop Songs reporters with 86 plays in the chart's tracking period, concurs with Rice.

"This song truly transcends barriers. It connects with listeners of all ages."

NOTHING BEATS 'EVERYTHING': Monica scores her first No. 1 in more than 13 years on the Adult R&B airplay chart (to be refreshed, along with all Billboard charts, tomorrow on billboard.biz), as "Everything to Me" lifts 2-1.

The song is Monica's second Adult R&B leader. On the chart dated April 12, 1997, she spent a week at No. 1 with "For You I Will," from the movie "Space Jam."

At No. 39 on Adult R&B, Alabama-born singer Cleer debuts with his cover of Bobby Caldwell's classic "What You Won't Do for Love." The song charted once before on the list, when Boyz II Men's version reached No. 11 in 2004.

Caldwell's original was a No. 6 smash on R&B/Hip-Hop Songs and a No. 9 hit on the Billboard Hot 100 in 1979. A remake by Go West reached No. 3 on Adult Contemporary in 1993.

'RUDE' RULES: Not sure if this means we might see a "Glee" episode paying tribute exclusively to Rihanna in the future, but the singer matches a chart feat previously achieved only by Madonna, whose music was the centerpiece of last night's "Madge-ical" episode of the Fox series. (The show's cast has already taken on Rihanna's "Take a Bow," reaching No. 46 on the Hot 100 with the ballad in September).

Rihanna's "Rude Boy" charges 3-1 on Hot Dance Airplay to become her seventh No. 1 on the tally, a sum that ties her with Madonna for most toppers dating to the chart's launch on Aug. 16, 2003 (coincidentally, Madonna's 45th birthday). Tied for third with four No. 1s each are Beyonce, David Guetta and Justin Timberlake.

"Rude Boy" concurrently rises 2-1 on the Rhythmic radio airplay chart. The song is the first No. 1 credited solely to Rihanna on Rhythmic. She previously reigned as a featured artist on T.I.'s "Live Your Life" and with Jay-Z and Kanye West on "Run This Town."

COMPLETE BEAT: While Rihanna adds her latest accolades at dance radio, as previously reported, newcomer B.o.B dethrones "Rude Boy" on the Hot 100, where "Nothin' On You," featuring Bruno Mars, bumps 2-1. Check tomorrow's posting of Chart Beat for a rundown on other rappers who've topped the Hot 100 with a maiden chart entry, as well as highlights from among Billboard's entire selection of sales and airplay surveys.