They got divorced after she fell pregnant with his close friend Simon Cowell's baby.
But Lauren Silverman, 38, was one of the first to congratulate her ex-husband Andrew after it emerged he is getting remarried.
The real estate businessman, 38, got engaged last week to wealthy widow Samantha Zimmerman, whose Bear Sterns executive husband Matthew died in December 2012.
Scroll down for video
Congratulations: Lauren Silverman was one of the first to congratulate ex-husband Andrew after he got engaged last week
A source closed to the couples exclusively told the DailyMail.com: 'Lauren was one of the first to congratulate Andrew and Samantha on their engagement.
'She and Simon are really happy for them both. The relationship between everyone is good.'
Pretty Samantha bears an uncanny resemblance to his ex-wife, who fell pregnant with the music mogul's baby while she was still married back in 2013.
Simon and Lauren's son Eric was born in February 2014.
Lookalikes: Andrew's new fiancee Samantha Zimmerman bears a striking resemblance to Lauren
It appears the ladies lots in common, as they recently spent a cordial day together in support of the former couple's nine-year-old son Adam.
The insider said: 'Samantha, Lauren and Andrew spent a day together this summer on Adam's camp visit day and had a really great day.'
Andrew settled his divorce from his wife of 10 years in November 2013, a development which meant Simon would not have to testify in court after Andrew cited adultery in the divorce documents.
'Everyone is on good terms': Lauren got pregnant by Simon while she was still married to Andrew and the trio would regularly spend time together such as here in 2012 in Saint Tropez
It was reported she got a settlement of around $2million, while it was also said they agreed Simon would not be allowed near their son Adam until this year.
X Factor judge Simon wasted no time in integrating his partner's son into family life however.
The source said: 'Everyone is on good terms and Adam is away at the moment on vacation with Lauren and Simon.'
Bachelor boy no more: Ladies man Simon has now settled down happily with Lauren and son Eric
ncG1vNJzZmivp6x7pa3IpbCmmZmhe6S7ja6iaKymqLWww8GisWiZoqm2pLjEZmpraGlsg3R7q5qsq52eYqCquNWeqaaZnmLAbrHXZp%2Buq5KWu6V5oKebq52nYrKvs8CgnJ1lopq6or7RsmSgoaKhs7O1xKebZouZoryveaKorp6knGK8r7GMnKann6KWwba4wK2cZqCZonupwMyl