India, Aug. 12 -- Former US President Joe Biden's daughter, Ashley Biden, has filed for divorce from her husband, Dr. Howard Krein, after 13 years of marriage. However, the exact cause of the split remains unclear because divorce complaints are not public in Philadelphia, and the duo has remained silent.

The papers were filed Monday in the Philadelphia Court of Common Pleas, according to The Philadelphia Enquirer reported.

Ashley and Dr. Krein, a plastic surgeon, married in 2012 at St. Joseph on the Brandywine Roman Catholic Church in Delaware, where Ashley was baptized, according to NewYork Post report.

They met in 2010 through Ashley's late brother, Beau. Dr. Krein proposed in 2011 at sunset on a cliff in Big Sur, California and they...