Rihanna rewrites the mark for most No. 1s in the 18-year history of Billboard's Mainstream Top 40 radio airplay chart, as "Only Girl (In the World)" rises 2-1.

The song is Rihanna's seventh Mainstream Top 40 leader, pushing the singer – and 2010 American Music Award winner (http://www.billboard.com/#/events/usher-black-eyed-peas-win-first-amas-of-1004128200.story?tag=hpflash1) - past Beyonce, Mariah Carey and Lady Gaga, each with six.

"Only Girl (In the World)" introduces Rihanna's fifth studio album, "Loud," which is expected to debut in the top 10 (http://www.billboard.com/#/news/susan-boyle-s-gift-to-keep-giving-on-billboard-1004127915.story) of the Billboard 200 to be refreshed, along with all charts, Thursday (Nov. 25) on Billboard.biz. The song has reached No. 2 on the Billboard Hot 100. Follow-up "What's My Name?," featuring Drake, topped the Hot 100 two weeks ago.

Here is a look at the seven songs that have propelled Rihanna into the lead for most Mainstream Top 40 No. 1s since the Nielsen BDS-based list launched the week of Oct. 3, 1992:

"SOS"
Date Reached No. 1: May 13, 2006
Weeks at No. 1: one

"Take a Bow"
Date Reached No. 1: July 5, 2008
Weeks at No. 1: three

"Disturbia"
Date Reached No. 1: Oct. 4, 2008
Weeks at No. 1: three

"Live Your Life" (T.I. featuring Rihanna)
Date Reached No. 1: Dec. 27, 2008
Weeks at No. 1: two

"Rude Boy"
Date Reached No. 1: May 8, 2010
Weeks at No. 1: two

"Love the Way You Lie" (Eminem featuring Rihanna)
Date Reached No. 1: Aug. 21, 2010
Weeks at No. 1: two

"Only Girl (In the World)"
Date Reached No. 1: Dec. 4, 2010
Weeks at No. 1: one (to-date)