Is PNoy dating Grace Lee?

The controversial Mo Twister who is currently in the United States had an intriguing post in his Twitter account last Wednesday night, "we are talking about Grace Lee's date last night with President Aquino. #itsmorefuninthephilippines"
Both Pnoy and Grace Lee didn't comment on the issue. Presidential Spokesperson Atty. Edwin Lacierda said “We do not comment on private matters of the President. So we cannot comment on that. You can ask me every time but you know our position on that matter.”
Aquino and Lee met in Cebu last June 2011 during the inauguration of the Korea Electric Power Corporation.