New Delhi Jan 1 (ANI): Charlize Theron and her boyfriend Sean Penn has secretly engaged on a trip to Paris in November, 2014. A source told a US Magazine that the duo decided to take their relationship to the next level. The new issue of the publication has revealed that Theron has accepted a proposal from Penn after dating for one year. The 39-year-old actress had earlier revealed that she wasn't afraid of long-term relationships.