IPA: /ˈhɑːrtˌθrɒb/
KK: /hɑrtˌθrɑb/
A person, often a celebrity, who is very attractive and causes strong feelings of love or admiration in others.
The young actor became a heartthrob after his role in the romantic movie.
Heartthrob is formed from "heart" (from Old English "heorte", meaning the organ that pumps blood and is often associated with emotions) and "throb" (from Old English "þrobbian", meaning to beat or pulsate). The word "heartthrob" refers to someone who causes a strong emotional response or excitement, often in a romantic context, akin to the feeling of one's heart beating rapidly.
Think of the 'heart' as the center of emotions and 'throb' as the beating sensation — together, they describe someone who makes your heart race with excitement.
No commonly confused words.