The couple - who had been together eight months - confirmed their split yesterday (20.04.15) and the 'Glee' star has reportedly been a shoulder to cry on for the 21-year-old singer.
A source said: ''Ariana has been getting tons of support from her 'Scream Queens' co-stars, especially Lea. Ariana looks up to her like a big sister and really trusts her input.
''Ariana has been very professional on the set and hasn't let the breakup affect her work, but it's obvious she's dealing with a heartbreak. She's more quiet than usual and a little down, but Lea always does her best to help put a smile on Ariana's face.''
And Lea, 28, has been sharing some of her favourite self-help books with Ariana.
The source added to HollywoodLife.com: ''Lea also has a lot of spiritual and inspirational self-help books on the set, like The Law of Attraction by Ester Hicks and The Four Agreements. She's been sharing her books with Ariana and that's been really helpful as well.''
Meanwhile, another source has claimed the former couple chose to split because of their globetrotting careers.
An insider told Us Weekly magazine: ''They made the decision to part ways because their conflicting touring schedules would keep them apart over the next year.''
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