Olympic medal-winning gymnast Tweddle has started training for the ITV ice skating competition already, according to The Sun.
[Beth Tweddle in action at the London 2012 Olympics]
"Olympians are competitive people so it was a no-brainer to sign one up," a show source said. "Beth has great poise for obvious reasons and was keen to give it a go. We've seen her on the ice and she's very good. She'll be a great contender."
Former EastEnders star Lapinskas will also reportedly take part, in addition to Coronation Street actress Samia Ghadie, who plays Maria Connor on the ITV soap.
"Matt and Samia will be great too. They're good skaters and our viewers love the soap stars," the insider added.
Dancing on Ice is expected to return to ITV1 in January 2013.
Watch Beth Tweddle's floor routine from the 2012 British gymnastics championships all-around finals below: