Real Housewives Of Beverly Hills star Taylor Armstrong had one heck of a 40th birthday bash.

Sources exclusively tell RadarOnline.com that her late husband Russell Armstrong pulled out all the stops for her 40th a few weeks ago, leaving no expense overlooked and dropping more than $60,000 for a special party at Beachers Madhouse at the Roosevelt Hotel in Hollywood.

"It was a very intimate party with a select group of people," an insider reveals. "On the surface both Taylor and Russell looked happy and were all smiles. He was very attentive to her, maybe even more than usual and I found that to be a bit odd. He followed her around and was by her side the entire time.