Actress Paula Patton files for divorce from singer Robin Thicke

Los Angeles - Singer Robin Thicke famously released a song Get Her Back to win back his wife Paula Patton after they separated earlier this year.

Well, that apparently did not work.

Patton filed for divorce on Wednesday, reported celebrity news website TMZ and Us Weekly.

TMZ said the actress cites "irreconcilable differences" in divorce papers but sources told TMZ that the split is "harmonious".

Patton's representative, Jeff Raymond, confirmed the news, said USA Today.

As reported, Patton filed the papers in Los Angeles, and asked for joint custody of their son, Julian, four.

The couple announced their separation in February this year, after almost nine years of marriage.

At that time, they said in a statement, "We will always love each other and be best friends, however, we have mutually decided to separate at this time."

Soon, Thicke went on a public campaign to woo back his wife.

He dedicated songs to her in concerts, and, last May, released Get It Back from the album Paula.

He also cried on stage at the BET Awards in June, saying, "I'd like to dedicate this song to my wife. I miss you and I'm sorry."

Their marriage had been "unravelling for a long time", Us Weekly reported then.

It went downhill, according to reports, following Thicke's controversial 2013 performance at the MTV Video Music Awards with Miley Cyrus.

His video for Blurred Lines, released earlier and featuring topless models, also created controversy.