Holly Allen

 is a houseguest on Big Brother 21 (US).

Trivia

 * After David Alexander re-entered the house to join Camp Comeback, he forgot Holly's name and accidentally called her "Beth", and it became a running gag both in and outside of the house.
 * Holly is the last female houseguest, and last houseguest overall, to be nominated on Big Brother 21 (US).
 * Holly is the first person to win HoH twice on Big Brother 21.
 * Holly is the sixth/seventh HouseGuest to make it past Day 78 without ever being nominated. The other houseguests are Derrick Levasseur, Austin Matelson, James Huling, Nicole Franzel, JC Mounduix and Tommy Bracco.