Alicia Keys admits Jay-Z wasn't impressed when her young son kissed his baby daughter Blue Ivy.

The international songstress performed the half-time show at the NBA All-Star game in Houston, Texas on Sunday.

Keys was joined by husband Swizz Beatz and two-year-old son Egypt at the event - where Jay-Z, wife Beyoncé and their daughter were also enjoying some family time.

Keys has joked that her son failed to impress dad Jay-Z, telling US TV series The Wendy Williams Show: "I think Egypt kissed Blue and I don't think Jay liked it very much. He called my husband and he was like, 'Watch your son.'"

Keys also revealed in the interview that both she and her producer husband would like to expand their family in the future.

She added: "I definitely love kids, I do. I... would like to at least wait two years."