"When Your In Love" strikes a new low in movie production. Grace Moore, looking as if she were stuck together with glue and paint, arches her new eyebrows, two inches above her old ones and is glowing with acquired charm for a period of an exceedingly boring hour and a half.

The story is transparently thin, and the acting is uniformly bad. Miss Moore, as an opera star deported by the quirks of the immigration law, who gets back to the United States by marrying Cary Grant, a wandering artist, is utterly unconvincing. Perhaps the worst scene we can recall, not only in this picture, but in all we have seen this year, is that in which Miss Moore plays fairy godmother to a particularly unpleasant crowd of yelling children by singing an inane song in her strained, professionally cheery manner. The rest of the cast, Aline MacMahon, Cary Grant, and Luis Alberni suffer from the lack of plot, and juvenile dialogue.

Rounding out the bill is a typical detective story picture, "Smart Blonde" featuring Glenda Farrel as a newspaper reporter who goes soft over a butcher-like sleuth (Barton MacLane).