It's A Boy! David Arquette & Girlfriend Christina McLarty Expecting A Son

Coco Arquette is getting a baby brother! RadarOnline.com can exclusively reveal that David Arquette and his girlfriend, Christina McLarty, are expecting a son.

McLarty -- who RadarOnline.com can reveal is currently five months along, and not four, as has been reported -- was practically glowing with baby joy as she and her boyfriend attended a Flaunt magazine party in Miami on Thursday night. Appropriately, McLarty was dressed in blue as Arquette happily pointed at her bump with his arm around her waist.

Just days before, however, McLarty was nowhere to be seen as Arquette partied it up in Miami for Art Basel.

On Tuesday afternoon, he was spotted drinking solo at Hyde Beach at the SLS Hotel South Beach. "He was relatively low-key," a source tells RadarOnline.com, as he drank wine and champagne before shopping at the Détail de Luxe pop-up shop on property.

Later that night, he attended a Lei Marco fashion show at the property, and even hopped up on the catwalk at one point to take a turn strutting his stuff for the crowd.

Arquette has been off the wagon and on the party train in recent months, as RadarOnline.com has reported.

After more than two years of sobriety, he was spotted pounding scotch and partying at strip clubs in Richmond, VA this summer.

He later admitted to Howard Stern that he is drinking again. "Id been sober for two years and four months and feeling that I wasn't being that true to myself, like what I enjoy and this and that," he said, confessing, "I'm a drinker so I drink a lot … I'll smoke a little weed."

His ex-wife, and mother of his daughter, Courteney Cox, is reportedly worried about his drinking and upset that he is becoming a dad again.