Singer Jang Geun Suk, star of "You're Beautiful" and "Pretty Man," is known as the "Prince of Asia" because of his widespread popularity. JYJ's Kim Jaejoong, star of Dr. Jin" and "Protect The Boss" has been called the most beautiful man in Asia for his near-perfect features. And the two talented, good-looking idols have also become good friends.

The two stars have known each other for a few years, after meeting up at various entertainment events, but they grew closer when they became neighbors and would occasionally bump into each other.

Jang Geun Suk said that one day when his parents were visiting, they saw Jaejoong lugging trash to separate into recycling bins.

"They had a whole new image of him," he said.

Living so close provided the two stars with more chances to connect and get to know each other better.

Apparently they occasionally go grocery shopping together. Jaejoong recently thanked Jang Geun Suk for lending him $20 when they went shopping.

"Let's go shopping again." Jaejoong tweeted.

These days Jang Geun Suk says he counts Jaejoong as one of his few close friends.

"I really don't have many friends in the entertainment industry," said Jang Geun Suk, who pals around with Park Shin Hye, Im Yoona, Lee Hongki and Ji Sung. But he often calls Jaejoong to talk about music and acting.

Jaejoong was also in the audience at a recent fan meet when Jang Geun Suk proposed to the entire audience. When Jang Geun Suk sent everyone in the audience a handwritten message asking if they had come for his proposal, Jaejoong got one too. He tweeted a picture of his keepsake.

Jang Geun Suk attended the 2014 Kim Jaejoong 1st Album Tour Concert held last month at Korea University. The concert also celebrated Jaejoong's birthday. At the concert the two singers joking around about how Jang Geun Suk was the "Prince of Asia" and Jaejoong was the most attractive member of JYJ.

Jaejoong expressed his gratitude for his friend's attendance.

"From cheering me on when my album was released, coming to see me during my concert and even singing a song with me, I can feel your sincerity and friendship in everything that you do," he said. "It may not be much but I remember everything that you do and I feel more grateful as time passes."

In the past Jaejoong has admitted that he did not immediately relate to Jang Geun Suk's frank way of speaking.

At first it was hard to be friends with him but now he's a close friend of mine, said Jaejoong. We both like to meet up casually and talk.

Jaejoong has also described Jang Geun Suk as a congenial soul, one with whom he immediately connects even if they don't see each other for a while.