Sia's 'Cheap Thrills' Hit The Top Of The Charts. Here's Why That's A Big Deal.

A milestone for women in music.

Congratulations are in order for Sia, who reached No. 1 on the Billboard Hot 100 this week for the first time in her career. Her single "Cheap Thrills" (featuring Sean Paul) knocked Drake's "One Dance" out of the top spot, where it had reigned for 10 weeks.

But this news isn't just a big deal for Sia — it's also a big deal for women in the music industry. 

This marks the first time in nearly 16 years that a woman over 40 has reached No. 1 on the Hot 100. To be specific, Sia is 40 years and 7 months old. 

The milestone was pointed out by Billboard reader Eric M. and confirmed by The Huffington Post.

The last over-40 woman to reach No. 1 was Madonna, who was 42 when her song "Music" spent four weeks at the top in 2000. The year before, Cher became the oldest woman ever to hit No. 1 at age 52 with her song "Believe," another four-week reign.

It's worth noting that Sean Paul, who is featured on "Cheap Thrills," is 43. But Huffington Post points out that it's a lot easier for a man over 40 to hit the top of the charts. In 2013 alone, Eminem, Pharrell Williams, and Wanz all achieved it.

The closest a No. 1 female artist has come to the over-40 mark since Madonna was Mariah Carey, who was 38 when "Touch My Body" made it to the top in 2008.

Sia is the second woman this year to hit No. 1 after Rihanna made it there in February with "Work." 

This time last year, Taylor Swift was the only woman who had reached the top. In October, Billboard projected that 2015 could tie for the fewest No. 1 hits by female solo artists since 1969, when there were none. Adele ended up saving the day in November with her smash hit "Hello," which stayed at No. 1 into the new year.

Here's hoping the rest of 2016 will yield even more female chart-toppers.

(H/T: Huffington Post)

Cover image: Helga Esteb / Shutterstock.com