LOS ANGELES (AP) — The cast of “American Horror Story” loved having Lady Gaga on set for the upcoming season. Actor Matt Bomer says she let them call her by her given name, Stefani (STEF’-ah-nee), and that allowed them to relate as human beings. Actor Denis O’Hare says Lady Gaga had a cast party with a swimming pool dyed blood red, and she had an obscene birthday cake for cast regular Angela Bassett. Lady Gaga says the cast has been “really open and available” to her in an honest way, so she could be herself. Lady Gaga plays a hotel owner in the fifth installment of “American Horror Story,” which premieres Oct. 7 on FX.