Oksana Grigorieva arrived at a mediation office this morning to listen to Mel Gibson's deposition in the former couple's custody case, and she appeared to be in good spirits when we snapped her walking in the door.

The deposition began around 9am, and Oksana's lawyer Daniel Horowitz revealed that Oksana is also working with First Amendment attorney Martin Garbus in an effort to win full custody of Lucia, who had her first birthday on Saturday October 30. Horowitz added that Oksana's legal team may rely on Mel's infamous phone recordings to show that he's an unstable father, which may prompt the judge to rule in her favor.