She’s been keeping busy on a promotional trail for the latest edition of Disney’s The Lion King.

But Beyoncé let her hair down as she enjoyed some quality time with her loved ones at her niece Teanna’s 21st Great Gatsby-themed birthday party in New York City on Saturday evening.

Joined by her dapper husband Jay-Z, the R&B legend, 37, looked every inch the siren as she slipped her killer curves into a sparkling ruby red gown, embellished with sequin-encrusted detailing throughout.

Flashing a hint of her lean legs, the singer’s incredibly daring ensemble featured a sizzling thigh-high slit, as well as a low-scoop neckline to showcase her cleavage.

The Houston native upped the style ante with her choice of footwear as she boosted her physique in a pair of tasseled strappy heels.

The Run The World songstress added even more glitz into her glamorous appearance with a fluffy plum collar and a selection of extravagant diamond jewellery.

With her tresses styled into her signature tight curls, The Pink Panther actress accentuated her out-of-this-world beauty with shimmery gold eyeshadow and nude lipgloss.

Meanwhile, rapper and businessman Jay-Z, 49, channelled his inner hustler as he donned a classic monochrome tuxedo set, complete with a satin scarf and a pimp-style cane.

While it is unclear whether Beyoncé and Jay-Z organised the party, their niece Teanna has long been treated to fun-filled parties for her birthdays, with the pair renting out indoor kart racing playground K1 Speed for her sweet 16th back in 2014.

In the work department, Beyoncé lends her voice to character Nala in computer-animated remake The Lion King. 

After watching the film, fans are convinced the superstar will bag an Academy Award for her latest track Spirit, which is featured on the film’s soundtrack, as well as Beyoncé’s upcoming album The Lion King: The Gift.