The 32-year-old took to Twitter to express her gratitude towards her fans and followers.
`Wow! 12 yrs! I came here as a scared lil 17 yr old. I thank u for accepting me and always giving my idiosyncrasies undying support. #Gratitude,` she wrote.
Priyanka, who shot to fame with 2003 film `Andaaz` -- for which she won the Filmfare Award for Best Female Debut, has starred in more than 40 films including `Aitraaz`, `Waqt: The Race Against Time`, `Krrish`, `Fashion` and "Gunday".
She was last seen playing the titular role in biopic `Mary Kom`.
Apart from her acting skills, Priyanka has also shown her singing abilities alongside international artists Pitbull and Will.i.am.
Her upcoming projects include `Dil Dhadakne Do` and `Bajirao Mastani`.