Taiwanese artiste Rainie Yang and Ann Hsu have known each other for 11 years.
According to Asian E-News Portal, the duo are known as 'sisters' in showbiz.
They attended an event together and shared a selfie of themselves.
In one of the photos, Rainie was stairing intently at Ann's revealing low-cut outfit.
Unlike her friend, Rainie was dressed conservatively.
See photos on Ann Hsu's outfit in the gallery below.