They are both showbiz babies, springing from wildly talented parents with superstar backgrounds.
So a friendship between Marvin and Rochelle Humes' daughter and Simon Cowell's son appears only natural, as it was revealed that Alaia and Eric, both three, are 'little pals' who love playing together.
Speaking exclusively to MailOnline, the former JLS singer discussed his daughter's high profile pal before divulging details of his marriage as he prepared to launch a funky collaboration with Cadbury where he is fusing music and chocolate.
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Bessie mates! Marvin Humes has revealed he and wife Rochelle's daughter Alaia and Simon Cowell's son Eric, both three, are 'little pals' who love playing together
Marvin has joined up with the confectionery giant after a study revealed that sounds not only matches how we feel, but also our preference for certain flavours.
Dividing into classic and modern flavours in the range, Cadbury Dairy Milk is grilling chocolate lovers over whether they feel like a classic hit or a modern hit, after which Marvin is planning to mix up chocolates to suit various tunes.
The handsome star soared to fame in 2008 in his boyband JLS, when he appeared on The X Factor, where they came second to Alexandra Burke. His wife Rochelle meanwhile, of The Saturdays fame, hosted the spin-off show Xtra Factor in 2015.
Due to their many links to Simon Cowell's brainchild, the family naturally built an affinity with the mogul, who shares his son with Lauren Silverman.
Doting dad: Music mogul Simon, 57, raises little Eric with long-term partner Lauren Silverman, 39 (pictured together at the launch of Winter Wonderland in London in November 2016)
Bumping along: Marvin insists his marriage to his pregnant wife Rochelle is 'far from perfect', although admits they are 'incredibly lucky' to have one another
Marvin revealed the sweet relationship between the tots, as he said: 'Alaia's going to be going to Eric's birthday party. They're little friends and they had a play date before and they hung out at the Capital Jingle Bell Ball...
'They played together in the little area. He's a little bit younger. Roch was working on Xtra factor so they would play together there. Roch is friends with Lauren. I wouldn't say I'd call Simon up and have a chat with him but I know I could call him.'
Rochelle and Marvin appear to be the perfect couple, with beaming grins, dazzling careers and an incredible home life - all ready for a new addition when they are set to become parents once more.
Yet Marvin insists his marriage to his pregnant wife Rochelle is 'far from perfect', although admits they are 'incredibly lucky' to have one another. The doting husband proved just how dedicated he is to his wife while discussing her pregnancy.
Fun in the sun: Little Alaia (pictured on holiday in the Maldives over Christmas) is getting ready to become a big sister for the first time in the next couple of weeks
Loved up: Of this pregnancy journey, Marvin said: 'She's done so well. Pregnancy is not a joke. It's the most natural experience. This second one has gone a lot faster.'
The boys: The handsome star soared to fame in 2008 in his boyband JLS, when he appeared on The X Factor, where they came second to Alexandra Burke
He said: 'We're far from perfect. There's times when we have crossed words but we're totally honest with each other and that's the key to a strong relationship.
'There was a time that Roch tweeted and she asked me about her makeup and she said: "Does my makeup look good?" I said something like it would be great for a shoot but it's not great. She said: "Charming".'
The couple started dating at the start of 2010 and were married two years later in an idyllic ceremony in Blenheim Palace. Rochelle gave birth to Alaia in May the next year and announced the most recent baby news this November.
Of this pregnancy journey, Marvin said: 'She's done so well. Pregnancy is not a joke. The body needs to go through so much in the period. It's the most natural experience. This second one has gone a lot faster.
'You're a lot more relaxed - sometimes too relaxed. Last time we were organised five months in but we're still prepping now. She's done incredibly well and I'm so happy. It's such a whirlwind time for all pregnant women.
The Voice: Despite his X Factor past, Marvin presented the show's BBC rival The Voice from 2014 to 2016, yet has not returned this year when the show moved to ITV
Adoring: The happy couple are preparing to welcome their new arrival in the next few weeks
'They go through body changes and hormones and it's such a big part of your life and of course they'll be times she'll try on a dress that no longer fits and it's a tricky time with going out and feeling confident. She's always been great with that.
'When I'm helping her out, she's done amazing and she's a real trooper. Seven years doesn't feel long. It feels like we've been together longer. We're lucky to have each other. We're lucky to have children and be happy.'
Despite his X Factor past, Marvin presented the show's BBC rival The Voice from 2014 to 2016, yet has not returned this year when the show moved to ITV. Despite the lack of invitation to make a comeback, the star is adamant he holds no grudges.
He said: 'I think The Voice always has changes and I'm still a big fan... I'm still supporting it loads. I had a chat with Simon about The Voice and I owe everything to The X Factor and I'll never forget where I came from. Simon gave me his blessing.
A trooper: 'When I'm helping her out, she's done amazing and she's a real trooper. Seven years doesn't feel long/ it feels like we've been together longer.'
A lucky guy: 'We're lucky to have each other. We're lucky to have children and be have'
'When I went down to see Roch on Xtra Factor and I was doing The Voice I'd come and see her and that was like the enemy where I came from but my wife's working on it. It was a weird funny one. But everyone saw the funny side and it was only lighthearted.'
Aside from impending parenthood, Marvin is particularly delighted about his musical chocolate collaboration as he revealed: 'It's fusing my two fave things - chocolate and music! Cadbury did this research that the music you're in the mood for affects what chocolate you want to eat.
'They came to me and I said hell yeah let's get involved. I'm a bit classic and modern. My dad was a DJ so I grew up with soul and funk so I like to listen to that. Roch would call me in an old man but I think still think I'm an 18'.
For a chance to win a one to one music masterclass with Marvin Humes, go to SoundOfCadburyDairyMilk-Spotify.co.uk.