Filed under: Oksana Grigorieva, Mel Gibson, Lucia, Celebrity Justice So you're wondering, how will Oksana Grigorieva spend $20,000 a month of Mel Gibson 's money on an 11-month-old baby? Sources connected with Oksana tell TMZ ... she has five reasons for needing 20k every 30 days: -- Lucia is Mel's daughter, so she needs… Read more