Beyoncé and Jay-Z support Erica Reid’s launch of her parenting book The Thriving Child

Last night Beyoncé and Jay-Z attended the launch party for friend Erica Reid’s parenting book The Thriving Child.

Beyoncé, 30, showed off her stunning post-baby body in a form-fitting teal dress, highlighting her tiny waist with a thin belt for the occasion, while husband Jay-Z in a printed T-shirt and denim jacket.

The singer, who welcomed Blue Ivy, her first child with Jay-Z, in January, left her blonde hair down and straight for the event, pairing her outfit with a pair of hoop earrings.

The pair looked more in love than ever at the party, held at a private residence in New York, with Jay-Z smiling as he playfully pinched his wife’s cheeks while the pair posed up for photographers.

Beyoncé and Jay-Z were joined at the event by other famous faces including Mary J. Blige, with the two female singers pulling in author Erica Reid for a tight hug at the event.

Erica Reid, the wife of X Factor USA judge L.A. Reid, decided to pen her bestselling book The Thriving Child: Parenting Successfully through Allergies, Asthma and Other Common Challenges after discovering that both her son and daughter suffered from serious allergies and irritations since birth.

Erica Reid, who is mother to 11-year-old daughter Arianna and eight-year-old son Addison, said in a recent interview that she believes in a firm but fair approach to parenting.

She said: “I love my children, I am very sweet to them but I’m also very firm with them, and they don’t get their way with every single thing.

“The world is not always going to present them with a silver spoon and I want them to learn that now rather than having them wake up shell-shocked in 30 years.”

Erica Reid’s manual is sure to come in useful for Beyoncé in the future, as the singer revealed earlier this week that she and Jay-Z are definitely planning to have more children.

She told Entertainment Tonight: “I definitely want to have more. I don’t know how many. God knows, I don’t know yet.”