Oksana Grigorieva’s legal team has suffered another blow -- her top family law attorney Allen Shiftman has quit the case, RadarOnline.com has exclusively learned.

He delivered the sudden news to the Russian musician a short time ago.

EXCLUSIVE PHOTOS: See The First Photos of Mel and Oksana In a Passionate Embrace On The Beach

Shiftman, a top Los Angeles family law specialist, replaced Mitchell Jacobs, who resigned last month, citing frustration with some of Oksana’s other legal advisors.

Jacobs had replaced high powered Hollywood attorney Sorrell Trope, who Oksana sacked — after sacking two other firms.