Billie Eilish’s “when the party’s over” is starting to gain substantial traction at pop radio.

Picked up by 42 Mediabase-monitored pop stations this week, “when the party’s over” ranks as the format’s most added song.

Thanks to critical raves, fan passion and monster streaming numbers, Eilish has already become one of music’s hottest artists. The aforementioned support for her first official pop radio single will only add to her mammoth buzz.

Julia Michaels’ “What A Time (featuring Niall Horan),” which landed at 37 stations, takes second place on the add board.

Each added by 30 stations, H.E.R.’s “Hard Place” and Cardi B & Bruno Mars’ “Please Me” tie for third.

The Chainsmokers & 5 Seconds Of Summer’s “Who Do You Love” follows in fifth; it landed at another 28 stations this week.

This week’s other notable pop radio options: Zedd & Katy Perry’s “365” (27 adds, 6th-most), Panic! At The Disco’s “Hey Look Ma, I Made It” (26 adds, 7th-most), Lil Peep & iLoveMakonnen’s “I’ve Been Waiting (featuring Fall Out Boy)” (24 adds, 8th-most, tie), Mabel’s “Don’t Call Me Up” (24 adds, 8th-most, tie), and Ariana Grande’s “break up with your girlfriend, i’m bored” (23 adds, 10th-most).

Major Market/Station Adds:

New York – Z100 – when the party’s over (Billie Eilish), Don’t Call Me Up (Mabel)

New York – KTU –

Los Angeles – 102.7 KIIS – What A Time (Julia Michaels ft. Niall Horan)

Los Angeles – 97.1 AMP – Going Bad (Meek Mill ft. Drake)

Chicago – B96 –

Chicago – 103.5 KISS – Hard Place (HER), I’ve Been Waiting (Lil Peep & iLoveMakonnen ft. Fall Out Boy), If You Want Love (NF)

San Francisco – 99-7 NOW – Last Hurrah (Bebe Rexha), Pretend (CNCO), Thotiana (Blueface), Hard Place (HER)

San Francisco – WiLD 94.9 – 365 (Zedd & Katy Perry)

Dallas – Hot 93.3 – I’ve Been Waiting (Lil Peep & iLoveMakonnen ft. Fall Out Boy)

Dallas – 106.1 KISS – break up with your girlfriend (Ariana Grande), Talk (Khalid), Be Alright (Dean Lewis)

Sirius XM – Hits 1 – Harry (Kelsy Karter), Please Me (Cardi B & Bruno Mars), Genius (LSD ft. Lil Wayne), Girl (Maren Morris), All The Ways (Meghan Trainor), 365 (Zedd & Katy Perry), Hurts Like Hell (Madison Beer ft. Offset)

Radio Disney – 365 (Zedd & Katy Perry)