The word 'Filler' is really annoying cause so many people take it to mean 'I don't like this song, therefore it's filler' when really, you can absolutely love a song whilst it's a filler.
Thinking of filler as a song which is only on the album to bulk up numbers, it's never gonna be considered as a single and it has no real meaning/speaks for the musician personally it has gotta be Rihanna. I feel the least time and effort and care is put into her albums. Like Linda Perry said about Katy 'Youve got your singles that everyone enjoys and buys and then you've got the rest. Who wants to buy a goddamn _____ album?'
So, in short;
Rihanna > Britney >> Beyonce >The Rest
I've never considered any Gaga track to be filler, or any tracks from Teenage Dream. I'd say the most filler is held by Beyonce and Britney, though what I consider filler from Britney is slowly decreasing.
Teenage Dream
Last Friday Night (T.G.I.F.)
California Gurls (feat. Snoop Dogg)
Firework
Peacock Who Am I Living For?Filler
The One That Got Away
E.T.
Circle The Drain Pearl Filler
Hummingbird Heartbeat Not Like The MoviesFiller One of the BoysFiller
I Kissed a Girl
Waking Up in Vegas
Thinking of You
Mannequin
Ur So Gay
Hot n Cold If You Can Afford MeFiller LostFiller Self InflictedFiller I'm Still BreathingFiller
Fingerprints
Lady GaGa: 9
Just Dance (feat. Colby O'Donis)
LoveGame
Paparazzi
Beautiful, Dirty, Rich Eh, Eh (Nothing Else I Can Say)Filler
Poker Face The FameFiller Money HoneyFiller
Boys Boys Boys Brown EyesFiller (And My Favorite Song) SummerboyFiller I Like It RoughFiller
Bad Romance
Alejandro
Monster So Happy I Could DieFiller (OMG MY FAVORITE)
Speechless
Dance in the Dark
Telephone
Teeth
Marry the Night
Born This Way
Government Hooker
Judas
Americano
Hair
Scheisse
Bloody Mary Bad KidsFiller
Highway Unicorn (Road to Love)
Heavy Metal Lover Electric ChapelFiller (And My Favorite Again)
You and I
The Edge of Glory
Ke$ha: 5
Your Love Is My Drug
Tik Tok
Take It Off
Kiss n Tell Stephen Filler
Blah Blah Blah (featuring 3OH!3) HungoverFiller
Party at a Rich Dude's House
Backstabber
Blind DinosaurFiller
Dancing with Tears in My Eyes Boots & BoysFiller
Animal
Cannibal
We R Who We R
Sleazy
Blow
The Harold Song
Crazy Beautiful Life
Grow a Pear C U Next TuesdayFiller