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Leann Rimes is having quite the busy week!

Besides planning a 39th birthday/Father's Day party for hubby Eddie Cibrian this weekend, the "Bonus Mom" also helped get her stepson ready for his preschool graduation luau, on Wednesday afternoon.

Rimes revealed via Twitter: "Up making lunch for lil bit's last day of preschool. He has a luau today....his outfit is FABULOUS if I must say so myself. He's rocking."

It's anyone's guess if Cibrian's ex-wife Brandi Glanville will be attending the weekend festivities, but it looks like smooth sailing with LeAnn, who shared a Twitpic of her stepson, with the caption: "Had to share his luau fabulousness!!!!! Mom and he are gonna rock out today. @brandiglanville have Fun!"