Filipinos came from the Malayan race, basically from Indonesia or Malaysia. In fact Philippines are in olden times a Muslim country with the only exception of having in the northern mountainous region to be pagans. But after the Chinese went on here to stay the Filipino race got mingled with Chinese blood because of the barter system of ancient Chinese are doing before the Spaniards came because some of them just stayed here to do business and are one of the top wealthiest in the country.
Then came the Spaniards when Philippines got discovered in 1521 and established their churches and military quarters. Of course it lasts for so many years and these same Spaniards took in the locals as wives if not sired some illegally with helpless women and then making the Filipino race even more mixed with diversity.
After the reign of the Spanish conquerors they relinquished the Philippines to the Americans for a sum of two million dollars so the Philippines became the commonwealth of USA. So the same thing happened, some Americans took some of the locals as wives and created "Mestizas/Mestizos" which are quite more beautiful then the average Filipinos but of course can speak the local language.
Japanese blood is also accounted for as well as other races for mingling with the Filipino blood and that created a beautiful race which is a step up from the common Malayan race in terms of appearance.
Of course not all Filipinos are beautiful but there are just a percentage that really stands out from the crowd because of the mixed race factor, the same is picked for the competition for beauty pageants because of their unique beauty and so they get a good chance to win it.