ABC’s “Jimmy Kimmel Live” is celebrating a first-ever achievement in the late-night ratings. For the first time during the regular television season, Kimmel’s show, which airs at midnight, topped Jay Leno’s NBC chestnut “Tonight Show,” which goes on at 11:35 p.m., TVbytheNumbers.com reports.

“Kimmel” reached the milestone last week, drawing 4% more viewers than Leno in the key 18-49 demo on Thursday, May 10, the story says.

For the week of May 7-11, “Kimmel” topped CBS’s “Late Show with David Letterman” by 4% in the 18-34 demo. “Kimmel” was the No. 3 talk show in late-night in total viewers, behind the Leno and Letterman shows. The show was up 1% year to year in both total viewers and adults 18-49, the only late-night broadcast talk show to post gains in either measure.

However, ABC’s “Nightline” continued its run as top dog in late-night, TVbytheNumbers.com reports. For the week, “Nightline” posted a 0.8 average rating in adults 18-49, followed by NBC’s “Tonight Show” (0.8), CBS’s “Late Show” (0.7), ABC’s “Kimmel” (0.6), NBC’s “Late Night with Jimmy Fallon” (0.5), CBS’s “Late Late Show with Craig Ferguson” (0.4) and NBC’s “Last Call with Carson Daly” (0.3).