Beyoncé stuns in red-hot dress with dangerously high slit

Talk about flawless.

Over the weekend, Beyoncé stepped out for a family member’s “Great Gatsby”-themed 21st birthday party along with husband Jay-Z, and stole the show in a look that was equal parts Roaring Twenties and eye-catchingly risqué.

The “Spirit” singer, 37, sparkled in a custom red gown by Walter Collection that featured a one-shoulder silhouette, hip-high slit and all-over embellishment; a similar style with sleeves from the designer’s ready-to-wear collection retails for $4,495.

Beyoncé accessorized with feather-adorned Jimmy Choo “Viola” heels ($1,895) and a jaw-dropping emerald- and diamond-encrusted Lorraine Schwartz cuff — the very same piece the star wore while revealing she was pregnant with daughter Blue Ivy at the 2011 MTV VMAs.

Jay-Z, 49, looked sharp as well in his white tuxedo and black pants paired with a matching bowtie, scarf and cane.

Gatsby and Daisy would surely approve.