Lovato earns her latest top 20 hit on the Hot 100 & second No. 1 on the Digital Song Sales chart after prior release "Anyone."

Demi Lovato's "I Love Me" debuts at No. 18 on the Billboard Hot 100 (dated March 21), arriving as the week's top-selling song.

The track starts at No. 1 on the Digital Song Sales chart, with 38,000 sold in its first week, ending March 12, according to Nielsen Music/MRC Data, following its March 6 release. It also drew 14.2 million U.S. streams in the week ending March 12, as it enters Streaming Songs at No. 36, and 15.9 million in all-format radio audience in the week ending March 15.

Lovato lands her second Digital Song Sales No. 1, with both leaders achieved consecutively: "Anyone" opened atop the Feb. 8-dated chart. "I Love Me" is also her 12th top 10 on the ranking.

On the Hot 100, Lovato adds her 31st career entry. She has debuted at higher ranks than the starting position of "I Love Me" with just three songs, led by "Skyscraper," which soared in at No. 10 in July 2011.

The Hot 100 (which blends all-genre U.S. streaming, radio airplay and sales data), Digital Song Sales and all other charts dated March 21 will update on Billboard.com tomorrow (March 17).