Ludacris’ hastily arranged marriage is a cheap trick in his attempt to gain full custody of his daughter … so says a source close to his baby mama.

We’re told Luda’s baby mama, Tamika Fuller, thinks Luda wants to show the judge in their custody fight that he now has a stable, loving household … more conducive to child-rearing than the home of single mom Tamika. She fears a Georgia judge could actually buy what Luda’s selling.

As we reported … Luda abruptly proposed to GF Eudoxie during the XMAS holidays and married her the very same day. Tamika thinks it was all just a ploy.

Luda is gunning to win full custody of their 1-year-old daughter Cai. He claims he’s a better parent and has the means to provide her with a better life.

Tamika thinks it’s a crass ploy to avoid paying $7,000 a month in child support.

The courtroom fireworks begin later this month.
TMZ