The Straits Times reported that on her Weibo page, the photo of the sleeping boys was captioned: "Psst, we're one month old on Aug 8!"
She also revealed the Chinese names of her sons, Jiyun and Ziran, who were born in Kuala Lumpur.
Pang is also a twin. He and his brother Danny directed Lee in horror movies such as The Eye (2002).
The couple's marriage looked to be in danger two years ago, when Pang was caught dating model Liddy Li, said Apple Daily. But he sped to Malaysia to apologise to Lee and, last year, she announced her pregnancy.