I'm gonna guess that's Abi or Emmy.

Seeing Team John and Team D+S are performing on Monday, we can guess accordingly

https://www.instagram.com/stories/thejaynaelise/3349103242079204460/   In this video that Jayna posted you can hear a female signing what sounds like "Lose You To Love Me" in the background. Perhaps that's a song choice for Billboard #1 Hit night?   (unfortunately that is one of my least favorite number 1 hits 😭)  

4   House 1: Tiffany Mitchell - Will Kirby - Alex Cirie Fields - Corey Da'Vonne Rogers - Gigi, Corey Vanessa Rousso - Gigi, Steven, Sola - SAFE Danielle Reyes - Alex, Gigi, Diana - SAFE    House 2: Sarah Hanlon - Sola, Corey Olivia Riemer - Chris Betty Yirsaw - Alex, Sola Cassandra Shahinfar - Diana, Alex, Sola - SAFE Sabrina Abbate - Alex   House 3: Claire Rehfuss - Corey Elissa Slater - Gigi Jordan Lloyd - Diana  Dan Gheesling - Steven Allison Irwin - Alex Janelle Pierzina - Gigi, Sola, Diana - SAFE  Britney Haynes - Diana, Gigi Felicia Cannon -   House 4: Nicole Franzel-Arroyo - Rachel Reilly - Sola, Diana, Gigi - SAFE Jen Johnson - Taylor Hale - Diana, Corey Keesha Smith - Akshar, Alex Jun Song - Alex   House 5: Ika Wong - Sola Neda Kalantar - Akshar Karen Singbell - Corey Britnee Blair - Chris Tamar Braxton - Claudia Campbell - Chris, Sola, Diana - SAFE Gary Levy - Alex   Keesha   ROUND RULES (Please copy with your vote): 5 votes per day, 1 hour apart. For each vote, you can vote for one houseguest to be saved from eviction by putting your name beside them.  Once a houseguest has received votes from three people, they can be SAFE. Please write which Houseguests you are saving. Please check for skipped votes and fix if necessary. The last two houseguests regardless of house without safety is evicted from the game.

3   House 1: Tiffany Mitchell - Will Kirby - Alex Cirie Fields - Corey Da'Vonne Rogers - Gigi, Corey Vanessa Rousso - Gigi, Steven, Sola - SAFE Danielle Reyes - Alex, Gigi, Diana - SAFE    House 2: Sarah Hanlon - Sola, Corey Olivia Riemer - Chris Betty Yirsaw - Alex, Sola Cassandra Shahinfar - Diana, Alex, Sola - SAFE Sabrina Abbate - Alex   House 3: Claire Rehfuss - Corey Elissa Slater - Gigi Jordan Lloyd - Diana  Dan Gheesling - Steven Allison Irwin - Alex Janelle Pierzina - Gigi, Sola, Diana - SAFE  Britney Haynes - Diana, Gigi Felicia Cannon -   House 4: Nicole Franzel-Arroyo - Rachel Reilly - Sola, Diana, Gigi - SAFE Jen Johnson - Taylor Hale - Diana, Corey Keesha Smith - Akshar Jun Song - Alex   House 5: Ika Wong - Sola Neda Kalantar - Akshar Karen Singbell - Corey Britnee Blair - Chris Tamar Braxton - Claudia Campbell - Chris, Sola, Diana - SAFE Gary Levy - Alex   Claudia   ROUND RULES (Please copy with your vote): 5 votes per day, 1 hour apart. For each vote, you can vote for one houseguest to be saved from eviction by putting your name beside them.  Once a houseguest has received votes from three people, they can be SAFE. Please write which Houseguests you are saving. Please check for skipped votes and fix if necessary. The last two houseguests regardless of house without safety is evicted from the game.