Beeld newspaper broke the news on Thursday morning with the headline "Karlien, Derick expecting twins".
Karlien tweeted on Thursday morning: "Some days I HATE the media and their 'reliable sources'. Good morning South Africa. I would have loved to share the news myself, but @BeeldNuus was one ahead of me."
The singer later tweeted: "Thank you for the well wishes for our 2 babies. It’s a wonderful privilege and I pray for God’s protection over them."
Van Jaarsveld’s mom and manager also vented on Twitter after the baby news was leaked: "I asked SO nicely yesterday that NOTHING gets published. I explained in a nice way that Karlien and Derick should have the honour of announcing the news first."
Brink also tweeted an angry message to the Beeld reporter who wrote the story: "Thanks Lourenza. For Nothing. Your word has the same worth as a Zim dollar."
Van Jaarsveld tweeted about her visit to her gynaecologist on Tuesday saying: "The sonar was WONDERFUL WONDERFUL AMAZING AMAZING."
The Uitklophou singer, who married Hougaard in March this year in Stellenbosch, announced her pregnancy news on 10 July in a series of Tweets.
She first tweeted "We have big news..." followed by "there's a small Hougaard on the way..."
She also jokingly posted this message on her website earlier this year: "If we fall pregnant it’s going to have to be twins, so I can catch up with my brother Bobby van Jaarsveld. But by then he and Annatjie might already have a third child on the way."
The tweets:
Partydae VERPES ek die media en julle 'vertroulike bronne'. Môre Suid-Afrika.Ek sou graag self die nuus wou deel maar @Beeld_Nuus is voor my
— KarlienvanJaarsveld (@KarlienVanJ) July 11, 2013
Dankie vir almal se seënwense vir ons 2 babatjies. Dis 'n wonderlike voorreg ek bid God se beskerming oor hulle.
— KarlienvanJaarsveld (@KarlienVanJ) July 11, 2013
Dankie Lourenza. Vir niks. Jou woord het dieselfde waarde as 'n Zim dollar.
— ronelbrink (@ronelbrink) July 11, 2013
Ekt gister SO mooi gevra om asb NIKS te publiseer nie. So mooi verduidelik dat dit Karlien&Derick se voorreg is om dié nuus bekend te maak.
— ronelbrink (@ronelbrink) July 11, 2013