How many winners of Binibining Pilipinas-International when Nina Ricci Alagao?
create table table_1825751_4 (binibining_pilipinas_international varchar, miss_universe_philippines varchar, PRIMARY KEY (binibining_pilipinas_international))
select count(binibining_pilipinas_international) from table_1825751_4 where miss_universe_philippines = "nina ricci alagao"